Do they? There's one thing to make it law, another thing to enforce it. OSA in the UK has been around since last July and managed to do nothing other than pick a fight with 4chan and get nowhere. I seem to recall someone mentioned Lemmy to Ofcom in a discussion regarding OSA and they were literally like "What's a Lemmy?"
How on earth do you imagine a regulator is going to work out how to deal with 50+ federated instances (for instance)?