> I wonder if allowing browsing without an account is compliant with the letter or the spirit of the law

Haven't read the law, but I don't think they considered this, since the most popular social media sites make it very hard or impossible to browse without an account. I guess with adult content bans they do consider this, since people don't tend to make an account there.

And a very similar fun fact: You can't browse facebook marketplace if you're logged into an under 18 account, but can without an account (at least here in Hungary).

Somehow, things are going to work better when you're not logged in...