> I can see it now, everyone and their mother would be recommending changes to it. People would want it at the extremes, or tweaked to just not recommend their pet peeves.

I think the solution to this is to let people switch between different recommendation algorithms, a stream of chronological tweets, most liked among recent posted, one powered by ML, etc. I don't see any reason the implementations behind this, or even Twitter more broadly, could not be open source. There are many other open source projects, like Signal that manage this just fine. And for a while, even Reddit used to be open source. It's definitely do-able.