Poison the well, make your enemy weaker. It's basic long-term strategy: Marxism for your enemies, powerful fascism for yourself.
Second, on a practical level, how did this happen? Someone from Saudi Arabia called up a Twitter executive and said "hey we think your platform could use more feminist perspectives" and they were like "oh yes, this makes perfect sense coming from you, and as you own 5% of our company we take your word as gospel"?
And obviously, what does Marxism have to do with feminism?
Sorry if you were joking, sometimes it's very hard to tell.