I started twitter for the same reason and now just use it because I made some actual friends on there (I mean digital friends but people I legitimately care about in that capacity).
I’ve not systematically purged like you, though I’ve considered it, but I have been steadily dropping peiople, one by one as i realize either they are just spamming or that they are assholes I dislike (or people who can’t shut up about politics).
I can honestly say I’ve met no one but good people here on Medium,a nd some of those have trickled over into my twitter.