There has been fairly widespread and well corroborated reporting that Matt has intentionally removed or incentivized people to leave who don’t agree with him.
My personal opinion theory is that either he is suffering a significant mental health crisis, or cynically trying to cash in on how widespread WordPress has become.
Of course we have seen this play out in FOSS history before, and we know how it goes, so it’s almost immaterial why he’s trying so hard to blow up his own spot.