I've felt this before I left over a year ago. A lot of my stuff was removed just for being not reactionary, not even just tankie shit.
I'm not sure if you remember, but when the chapo sub got banned, those of us with a history of posting there had our upvotes and downvotes removed. Like we'd upvote something, log-off, and the upvotes disappeared.
IMO, a lot is in play here. Reddit tends to ban overly hostile mods, and people with lots of free time (i.e. people with material resources) are gonna be mods. But there's no reason that a huge social media company isn't going to try to crack down on subversive thought. Anti left behaviour is as old as capitalism itself.
h3h3 subreddit
Zionists aren't going to tolerate even the most civil conversation with the other side. You're not wrong to be upset, but I'm not at all surprised.