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.
Discussion
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.