I remember Matthew writing this post on the Racket Group two years ago: https://groups.google.com/g/racket-users/c/TU5n-Z_odLY/m/f2KzHK7eCQAJ Unfortunately, that post can now be read in a completely different light, as a kind of alarm that no one heard at the time.
Interestingly, recently another member, Leandro Facchinetti, also left the Racket community, reportedly for similar reasons. (see https://www.youtube.com/watch?v=_wY7FBtr7_c ) Obviously, something is rotten at the very core of the Racket community when things like this happen so frequently.