The other is very minimal monthly fee which most ladies will gladly pay for peace of mind.
I cannot speak for National Blacklist because I am not a member there and disagree with how they do things....but, the two I belong to, we have to give our provider identity, email, phone, links to website and reviews when we sign up. We can create an alias and most do because information does get out and get back to clients and other ladies too. Sometimes, we would be harassed by other providers (or clients) who had a good experience with the guy that was blacklisted. It is important to remember that just because Joe Schmoe was a perfect gentleman for one lady does not mean he wasn't an abusive SOB to the next lady. It happens.
Providers have so little resources at their disposal to stay safe. Blacklists are only one resource. And when one method of safety is sacrificed, not only do providers feel vulnerable and betrayed, it also can put us in danger.
Do blacklist sites make money.......yes, but so does TER (and men use TER to stay safe in the sense they can use it to avoid rip-offs, bait & switch, gage legitimacy, etc.)
Are blacklist sites misused......yes, providers should limit their reports to the most serious offenses and offenders.
Are blacklist reports 100% reliable....no, but nothing is.