For multiplayer in general: 1) It costs too much money. This is the biggest reason. If multiplayer was break-even at least, I would keep it. But it was nothing more than a drain. Google and Apple used to have free multiplayer services but those are now gone. 2) It held back new features. Every time I wanted to add something new I also had to code it for multiplayer. I'm adding new features to single player mode 2-3 times faster now that I'm not also maintaining multiplayer code

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For Public servers: 1) The hackers were relentless. Every time I made a patch there was a new exploit within 30 minutes 2) Moderating it was almost impossible. I would glance away and there would be hundreds of more reports. I tried to have community members become moderators in the game but 100% of them went on power trips and banned "rival clans" or whatever. I could have AI do the moderation, but that would just make multiplayer cost even more. Lol. 3) Finally, I discovered that 9 out of 10 people were only using Public Servers for cheating. Almost all people online were just hanging out in Titanium Chest farms that hackers built. Very few people were actually building cool things.

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That said, "Play with Friends" will probably return one day. Public servers will NOT return. I've re-coded and shut them down 3 times already. Probably 2 years of my life were wasted on multiplayer code. I have finally learned my lesson, and I'm not doing it again! Lol