So, you have at least one example of this scenario (gay Cloudflare employee gets doxxed and harassed) ready to tell us about, right?
If that doesn't work make the part you don't like illegal. Enshrine something like the "right to be forgotten" stuff into law and make them take down threads if the people they refer to don't want them up.
I know it's hard to word something like a "right to be forgotten" without making it to broad and a tool for abuse of chilling speech but it seems worth the effort if the consequences are this dire.
If you would stop derailing the conversation with unfeasible solutions.
If you want an example for such targeting though, Liz Fong-Jones has a thread on Kiwifarms because she's outspoken and worked at Google (and thus being seen as more influential / more of a threat). The thread has also significantly slowed down after she left Google.