Question on Why Some Websites Advertise/Allow Sex Posts and Others Don't

Upfront, I am in no way suggesting that ECCIE do anything different than what they feel is best for them. This is just an honest question trying to learn.

Was on DoubleList and noticed they have a SF based phone number and address. Yet they serve as conduit for people ostensibly to have sex. And there are other sites that advertise "services" and some are outright selling sex.

Craigslist stopped this when that particular law was passed. Let's not argue about it's merits, please. And ECCIE stopped allowing women to post ads if I remember correctly.

So if CL and ECCIE are right, why are those other businesses still operating? Or, maybe to contradict my opening statement, why haven't CL and ECCIE got in on the game?