They understand just how hard it would be to comply. And that's the point. Make it hard enough to meet the requirements to not make worth a business' while to comply. And the politicians can say "We didn't ban PornHub. They blocked you from access."
It's a common tool both the left and right use to control behaviors. Governments around the world do this all the time.
The only ads I see are on a local sports podcast. The advertisers are all local businesses. From restaurants to local credit unions. And those I'm fine with.