I'm sure they have been blocked, many times. Some online services simply fetch the tor exit node IP lists from the tor project and block them all pre-emptively.

I'm sure they have been blocked, many times. Some online services simply fetch the tor exit node IP lists from the tor project and block them all pre-emptively. The thing is that I rotate my tor nodes every other month, manually. No pipeline setup for this yet. So I destroy old VPS and create new ones with the same signing key and family in the node info. I suspect you're talking about running an exit node at home, or on an IP-address that matters. That's a stupid thing to do.