What liability?
The liability of some asshat like Ken Paxton suing them over Texas residents being able to access adult content without an ID by going through a VPN, and then Visa/Mastercard pulling out, and killing their revenue. Pornhub didn't really care about all the reported abuse content at first. They only cared when payment processors got involved and then Pornhub deleted all of the content uploaded by non-verified users and required users to be verified before they could upload. Look at what just happened with adult games on Steam and Itch because of pressure from payment processors.
It is utterly ridiculous to uphold a website to a state laws they have no presence in.
Then maybe you can convince Fansly to stop requiring an ID for connections from VPN providers (they are already doing this).
All website have to do is geoblock and reject payments from those states.
Why in the hell would a company that makes their money off of a percentage of the creators' revenue (sites that already have ID requirements and implementation for the content creators to keep the payment processors happy) rather than ad revenue do that? If the creators start losing huge chunks of revenue because either the platform is blocking a third of the country or the payment processors leave, then the site will lose the content that brings the customers to it.
Or do you think retailers across state borders should stop a customers from buying products that are ‘illegal’ in their home state?
No, I don't. And I don't think sites should be complying with these stupid ID laws either. But here we are, and here they are. So what does my opinion even matter?