I don't really care if the lurkers stay on reddit, but I'd like for the creators to transition here and I'd like for this to be the place where you find the good information.
Rather than berate people who stay, I'm offering carrots / breadcrumbs. In the communities I was active, I'm still monitoring what's being posted. Instead of posting new content or answers I'm composing content (with a paraphrased question where appropriate) here on the fediverse and simply providing a link to my response in the reddit thread.
Will reddit start blocking the fediverse? Maybe. Will my posts be downvoted or banned? Maybe. Do I care? Only in that it reduces the visibility of good content. And maybe that's enough to drive people to look in places other than reddit anyway.
I believe this is a long-view approach to migrating away from reddit, and helping others do the same. Reddit will not collapse overnight (as entertaining as that would be), but rather will be a long, slow tapering as the Next Thing^TM^ takes hold. And I'm hoping that this is that next thing that is less likely susceptible to corruption.
Fighting the good fight