> The individual had used the "Sign in with Facebook" option on the EU login webpage to register for a conference. The court, which hears actions taken against EU institutions, found that this transfer of the user's IP address to Meta Platforms in the U.S. violated EU data protection rules.

Which means he already had a Facebook account, so this is only about his IP being given to Meta one time. 400€ per case for this violation seems pretty reasonable.