It should be a criminal act to ban someone from your platform without pointing exactly to why they were banned. "Oh but we can't expose details of our ban process for people to game" Bullshit. They just don't want to have to answer to anyone for cutting them off.
Exactly. If that were the reason, they should also make the rules of the platform secret, since making the rules public will result in people "gaming" (aka "acting in accordance with") them.