Thomas,
That sounded so reasonable and persuasive that would it be a good idea to have a formal opinion written to give to server companies early on?
They might still be looking at the time it takes to deal with notices or police queries but they must accept that the risks of allowing Tor are miniscule. Perhaps the way around the remaining deterrence is a Tor response 'centre' for them to painlessly redirect irritations to.
Robert
Yes there are safe harbour provisions.