Laws are also the most effective tool for destroying rights, arguably much more so than protecting them.

So the flip side of your position that someone needs to be subject to a foreign law when dealing with a foreign party because otherwise that parties right might be stommped is that they also need the means to block interactions with that foreign party so their own rights aren't potentially stomped.

In the case where there are sales you might actually know where the other parties reside, but in the majority of interactions online you don't and there is no great means to control your exposure to other jurisdictions.