Oh they cite it, but it's all about cost savings. Customer service costs. By refusing to interact, a platform like airbnb saves into 7, likely 8 figures easily.

Abusers/scammers always, always know why they are banned. It doesn't help a bit to not-disclose. A google search will turn up the why of it too.

The real gain here is fiscal.

I'm beginning to think that the only response here is legislative. Make it illegal to cancel accounts without a full rendition as to why, and evidence to validate the same. Essentially, statements of "you broke the ToS" turn into "here's how you broke our ToS".

And most importantly, the ability to challenge the evidence.

To make it easy on small corps, maybe there should be a corp-size requirement. Lots of stuff (fiscal duties, for example) change over a certain size.