I don’t know of any specific laws against them enshitifying adblockers. But there are things like the GDPR and in the EU big tech corporations are under constant scrutiny by regulators. Making them a lot less likely to do these kinds of shitty things in general. I assume that’s why she/he’s asking. Perhaps pressure from regulators has caused them to reframe from engaging in this same behavior in the EU? Out of caution?

Edit: I use the modified version of the Youtube app on iOS (uYou) and the skipping behavior happened to me and it reminded me to respond to your comment. I’m pretty sure they’re breaking adblockers on purpose.