The review part is much more concerning IMO and completely exiles FOSS from the platform (free as in the GNU definition -- you should be able to make arbitrary changes to your copy of the app without some asshole from Apple telling you that they believe your changes constitute a joke or prank [1]). The review part also re-enforces the revenue part because it costs $100/year to submit apps for EU notarization.

[1] Section 1.1.6: https://developer.apple.com/app-store/review/guidelines/