Sure there are, and there will be ways to get around it, it's a jumping off point. I can say firmly though I'd much rather have a token stored in my browser proving I'm over 18 vs every porn site knowing exactly who I am and the government knowing every porn site I visit. I'd rather give up some freedom from my browser to keep privacy vs giving all of my data on my kinks to the government.

Guess I'm trying to say "There are other ways of solving it that don't require handing over all of my data to the government or have them track me site to site"