Right. What makes some less abusable than others? Do more of that.
You obviously can't eliminate all abuse but it can be managed to an acceptable degree with thoughtful design.
This is getting away from my larger point that the incentives here are screwed up. Why is that? Why doesn't Google fix their shit? What is blocking this from fixing itself? Usually there is an incentive like threat of lawsuit or people leaving the platform.
This feels more like handwaving than brainstorming ;-)
It's a tricky problem and I think your suggestions should try and reflect that as much as possible.