True but the wording of the act actually places the onus on the service provider to verify the identities, not on the user to give them. It would be Discord in this case having to make the legal defence.

>It would be Discord in this case having to make the legal defence.

There's no rule that only 1 entity can get in trouble.

If I use a fake ID to by smokes while underage, I will definitely get in trouble for that and the store that sold me the smokes may also get in trouble (depending on how realistic the ID is, etc.). If the provider of my fake ID is found, they also get in trouble.

I haven't yet heard a compelling argument why this website (who, in the analogous scenario above, would be the fake ID provider) would not be subject to the same logic.

I hope that the defense of "this is a satirical website" is strong enough (or preferably, it never even has to be put to the test), however given what I've gathered about the general attitude UK legislators have regarding the internet, I think it is more likely that they would do anything in their power to try and punish someone operating a site like this.