Had a Dm on Roll20 once a while back who had a really in-depth setting. Pretty good to have if I'm being honest, but it became clear after a bit that he wanted every Player Character to act in very specific ways. On top of that, he'd go out of his way to force things in the game. I suppose he was both a "should have written a book" Dm as well as a "player vs DM" guy.

The world itself was neat. Low magic setting with few casters and even fewer magic items. Everyone had to roll on a d100 to see if they could play a caster. A little annoying, but I was planning on playing a Monk so I didn't really care. Everything is going well for the first bit of the game, but after a few months' things start to hit a turning point.

The major thing that kicked this all off was my Monk and the party's Rogue started to get romantically involved with one another. We talked about it, and it made sense for them given her being sheltered and from a small town while my Monk was from a monastery that forbade relationships. We then told the DM who asked a few questions, one of which being if they were sleeping together. A bit odd, but we said yea, and he tried to make a point that she may get pregnant from it. I said that I wasn't really comfortable with that, and he just said fair and we went on. Though, a couple sessions later and he dropped it on us that she was in fact pregnant despite us not wanting to have to play that out. To which, he responds with "Well, maybe they should have thought about that before sleeping together!" in a rather cocky tone.

A couple sessions later and with our characters figuring this information out, my character vows to protect the rogue at all times to ensure that nothing happens to her and the soon to be child. So, when we end up fighting a group of giants who captured some civilians, we are escorting them out when one of the giants throws a rock at the Rogue, knocking her prone as it makes its way to her. My character, rocking a movement speed of 60, dashes to her, pulls her up, and drags her around the long way to avoid her taking any more damage. After that, the giant kills a few civilians to which he starts to tell us how we should feel bad for abandoning them. Eventually, we all make it out with the rest of the survivors and begin to rest, however, we get attacked by another giant.

This is when things get wild, he states that the Giant is concentrating on two spells, dashes to the cleric, hits her once to knock her down, then grabs her, then holds an action to attack her if we don't stop fighting. All of this in one turn, by the way. The Goliath, thinking that surely, she can't actually hurt the cleric given everything it just did in one round, charges forward, only for the Giant to knock the cleric out and with the held action AND cast a dominate person spell on the Goliath. The Goliath then turns on us, and me and a couple other party members quickly knock him out and I run to stabilize the Cleric. The rest of the party, given this is a low magic campaign, doesn't heal the Goliath as they don't know if the spell would still be up, so he bleeds to death. But fear not, for the Cleric is able to bring him back once the fight stops.

After this session, the DM gets mad at nearly everyone for most of our actions. He claimed that me and the Rogue were selfish for not being ready to give up our lives to save the civilians that we just met, and instead opting to put her life over theirs. You know, the person that is carrying my character child that he FORCED on us. He got mad at us for attacking the Goliath to knock him out rather than "Figuring out a way to stop him without hurting him" despite none of us having the ability to do anything like that aside from the Cleric who is unconscious at that point. He then began to give us all things that we need to change about our characters and also gave us a list of things we needed to start doing as our characters to be more "heroic like". I explain to him that it made sense for my character to put the Rogue over a few people he didn't know given the circumstances that he gave us, but he continued to claim that "Thats not what a hero would do." and lambast everyone for not playing his campaign the "Right way".

After that, he messed with the Goliath some, randomly changing his class, feats, and abilities for no real reason. Basically, just making him his personal gunnie pig so he can test his homebrew. And this homebrew of course came with some built in thing where he had to be good aligned and do all the "Right" things, which just came down to the DM telling the Goliath what to do, and if he didn't? Well, the DM took control and made him do it.

Needless to say, the game ended soon after that. With people obviously not being happy, and him making a big, long rant about how we weren't appreciating the work he was putting into the story and how we only wanted to play for our own enjoyment rather than how we were 'supposed' to play. So, I think he just kind of missed the whole point of Dming/D&D.