Probably nothing. Especially since GDPR isn't enforced that heavily. But I also understand why US companies are doing this. It's kinda like when my dad got par

Probably nothing. Especially since GDPR isn't enforced that heavily. But I also understand why US companies are doing this. It's kinda like when my dad got parking and speeding tickets sent home from a foreign country. Most likely nothing would happen if he didn't pay them, but you never know when you want to go back to holiday in $country, and the border agent sees them in your "permanent record". It's at least imaginable that the EU _could_ do something similar, ask for a fine and if not dealt with, the company (or even worse directors of the company) getting some kind of dent in the proverbial permanent record. (I'm not saying that it's likely, but if EU visitors aren't a big user base for your local regional news paper, I see why it's so tempting to just check the "Block EU visitors" checkbox.)