I'd encourage you to read "Talking with strangers".
There's a section in there about the anchoring effect, which basically talks about how if you increase patrols in the worst parts of town and get crime there down, it mostly doesn't just move "elsewhere". These people had good reasons for being drawn to parler and while it won't stop anybody, it's a significant blow I think.
The counter-argument is that the main draw of Parler was deplatforming (of people who weren't calling for violence) on mainstream platorms. In hindsight (and for some, in foresight), finding some pool of center-left content to suggest to viewers of far-right social media personalities, and center-right content to suggest to viewers of far-left social media personalities probably would have been a much better long-term solution. I also think you'd want to have 1-month or 3-month suspensions for suggesting violence, rather than full deplatforming, to reduce the number of followers who jump to more extreme platforms.
Edit: actually, I think you'd one pool of center-left and center-right content to show to both extremes, to make the medicine taste less bitter.
There's a section in there about the anchoring effect, which basically talks about how if you increase patrols in the worst parts of town and get crime there down, it mostly doesn't just move "elsewhere". These people had good reasons for being drawn to parler and while it won't stop anybody, it's a significant blow I think.