Because that's where the audience they write for is.
Because they prefer Twitter threads to blog posts.
Because they get more readers that way.
(And probably anyone here can come up with some more reasons that might be true if they put their minds to it.)
But mostly, the format someone chooses to make this available in is the least interesting thing about it.
https://mobile.twitter.com/Foone/status/1454530751475552256
Foone is a sociopath who doesn't feel certain words should be used to refer to Foone because they don't like them. In fact no one should talk about Foone ever.
