It sounds like apple can still stop you from running software “for security”. Hard to tell from the wording what it really means

>in order to ensure that third-party software applications or software application stores do not undermine end users’ security, it should be possible for the gatekeeper to implement strictly necessary and proportionate measures

https://eur-lex.europa.eu/legal-content/EN/TXT/?toc=OJ%3AL%3...