That’s exactly what I was worried about, and I’m really really not comfortable with. Especially because it’s the most valuable data for training ML models to manipulate with people, or to keep them interacting with a website they want, which is something that I fear the most from the current advances in AI. I know it’s already happening for a long time, but I don’t want to help them with making it even better.

So, definitely defederate. I’d even say that there should be an option implemented that would allow the users to defederate on their own, which would not allow their posts or comments to show on other instances they’ve defederated with, while also not showing them any content from said instances.