They also do this to save on staff costs; if you don't tell someone why they were banned, they won't have any counterarguments either, nothing to try and argue with.

No room for arguments = no time needed for a human to interact.

For a while now, it's become pretty common knowledge that the big tech companies do not want anything involving people, because people don't scale. This is also why they invest so much in "AI" tooling, so there's even less people needed.