@polotek If you're looking for a serious answer: a) because I don't control any instance nor have the skills run my own, and b) because I don't want to have to play whack-a-mole everytime some techbro wants to pipe my stuff into an advertising server. No, I CAN'T just make my instance opt out.
@sbszine these are all reasonable assumptions. They are false. But I understand why you think you have these limitations. That still doesn't explain why you think the right alternative is to yell at other random private citizens every time they misstep when trying to participate. That's not a world I wanna live in either. Maybe this whole fediverse thing was a mistake?