The problem is compounded by the fact each BL company is racing it's way to the bottom, adding each others finds to their own lists. SpamHaus has OVER 1 *BILLION* addresses listed.
I lost several relays (11) from OVH because DanTor recorded my relays, then CBL recorded DanTor, then SpamHaus Zen recorded CBL, which allowed OVH to claim "100% of your IPs are blacklisted on multiple lists" when in reality it was from a guy in the UK who publishes all Tor relays - guard, middle, exit - that caused this whole problem for me. Not one single complaint from anyone against any of my relays.
Matt Speak Freely