How do you mean more permissive? I thought that, by world and historical standards, US laws are very permissive. The bigger problem in the US is that governments at all levels are willing to use extralegal means to harass porn creators and distributors. For example, the Obama era “Operation Chokepoint” didn’t pass any laws or write any regulations. The Department of Justice just let banks know that although it was perfectly legal for them to do business with the porn industry, they might be investigated for fraud or money laundering if they did. Even today, You can’t pay PornHub with a credit card.
Discussion
Escorting is legal. US Relays that allow escorts to be clear about what they do, will eventually be told by either LEO or Lawyers about SESTA/FOSTA. Twitter gets away with it because under their previous ownership they made it clear they'd take it to the Supreme Court. Most relay operators couldn't do that.
The Pornhub thing was because they allowed illegal material - minors - so the card companies kicked them out. You can still buy porn with cards. But card rules are such that you can;t buy some legal porn with cards.
Permmissive also isn't just law, its environment. On paper Russia is a democracy.
Twitter is no exception; they are currently being sued thanks to FOSTA, and sex workers are no longer welcome to do business there. PornHub, like many sites, allows user uploads and sometimes users break their terms of service. Unlike those other sites, they are singled out for persecution by anti-porn activists.
Twitter clearly planning to fight SESTA/FOSTA then, because they don't act is if they are worried.
Rule 1 of campaigning, pick the obvious baddie, use them to make your point. They picked PornHub. PH started by letting anyone upload anything, including ripped and stolen scenes that companies had invested in producing. Manwin started with piracy to build a brand, then tried to become a "good guy" but their old habits died hard and they had too many smoking guns.
I've been involved in many campaigns over the years and I'm not going to be shocked or complain when the other side knows the playbook :-)
The card companies brought in lots of extra compliance for platforms as a result of PornHub. In effect they forced the platforms to follow the same rules as normal publisher porn sites and closed the UGC loophole.