Last week I created a brand new Facebook account as I recently moved to a new city and am somewhat desperate to meet people, and Facebook events can be useful for this (as much as I loathe Facebook, my mental health is a bit more important right now). I got banned after about 2 minutes. I didn't actually do anything on the platform. I managed to click to about 2 or 3 pages.
What set this off? Who knows. Maybe some browser settings? Previous user(s) of my IP address? Those pages I clicked on? Something else? It surely wasn't anything I actually did as I didn't really interact with the platform at all.
I suspect that if I asked some high-up Facebook engineer to look in to it they wouldn't be able to actually give me an answer either beyond "The Algorithm determined there were risk factors".