https://www.theguardian.com/media/2020/dec/03/draft-eu-legislation-seeks-to-counter-dirty-methods-in-europes-elections

Sites such as Facebook will have to publicly disclose identity of people and entities funding such advertising

The “dirty methods” of the Brexit referendum have been cited as a reason for new EU laws aimed at tackling disinformation and forcing online platforms including Facebook to publicly disclose the identity of people and entities funding political adverts.