I don’t see that being killed soon. The 3% for payment processors is a lot higher than the 0,2% or 0,3% limits for debet/credit card payments within the EU (https://eur-lex.europa.eu/EN/legal-content/summary/fees-for-..., and AFAIK no payment processor decided to leave the EU market because they couldn’t earn money anymore.
There also is ‘prior art’ for that 3%/27% split in the case of dating apps in the Netherlands, where the Dutch regulator declared that OK (https://techcrunch.com/2022/06/13/apple-dutch-dating-apps-pa...). AFAIK, there hasn’t been further action on that front.