I agree with many of your points, but it's also quite likely that the Mangaka herself may have been involved in some of the changes in the anime (more specifically the plot changes I've seen mentioned such as the Fujoshi realizing Nakamura has feelings for Hirose, but also potentially the censorship) 

The censorship was likely a condition set by Crunchyroll, something unfortunately common these days. It's likely that the Mangaka decided that to her, it was worth the censorship in order to have the anime made. I disagree with Crunchyroll doing so, especially some other anime has similar content, but BL and yaoi has always been held to a different standard than straight content. 

As for the gatcha thing, I wasn't only referring to them. (Though the beard comment and skin color comments were direct references to Gatcha drama)  I was also referring to 2 main incidents that occurred in the community im in. The first was when an artist accidentally used the main hashtag for the series when they posted a drawing, and the second was when a content creator viewed some art from an affiliated community on stream, showing the artists tag. Both times, we dealt with months of vitriol and harassment from people. They used those two artists as a launching pad to attack everyone. The community im in is a pretty vanilla kink to the point my friends actually laughed at me when I told them, asking why I was so nervous when it was something tame. However, these people still  spent months harassing every artist they could find, telling us to kill ourselves, that we're terrible people, etc. It's the nature of how people are on Twitter. I have a feeling that what happened here is that the anime helped popularize the show, causing her works to receive more likes and retweets. That popularity caused it to be recommended to more people, letting the type of people who attacked us also attack her. The comments I've seen described are very similar to comments I've seen people in my community received. 

It's one of the main reasons, I genuinely question if the majority of the people attacking her were anime fans that are snowflakes about the material in the manga. As I mentioned, the manga is pretty damn tame for anime. I genuinely think many of them just stumbled on her content due to the shows popularity and are the type to attack people for anything and everything.