I just tried to set up an eBay account to buy an exhaust part. I created the account, sent the seller a message and twenty minutes later, I got a notification from eBay that I (and anyone from my household) was permanently banned because I was a "threat to the eBay community".
I haven't been on eBay for ages, and as far as I know, was certainly never threatening to anyone on or off eBay. Nobody at eBay would tell me what had gone wrong -- in fact, as soon as I asked what the problem was, they said that they had to "end the call now".
Maybe if I had signed up in person, they could let me know what crimes I'm supposed to have committed or at least save me a hour by not allowing the signup in the first place.