For example, you can't advertise overtly for political candidates or parties. You can't advertise if you are a political party or an org that has candidates for election. Of course they will then use supposedly independent orgs who are totally not affiliated with the party, but again it's some friction.
In Hungary, since Fb banned political ads in the EU, the previous governing party had a much harder time in advertising themselves, they tried but didn't manage to go around the rules at scale.
> defining "political" ads
Yes, and people will also complain that you now suppress serious conversations about people's lives and want them to live in some rose tinted walled garden where they can only post wholesome sanitized corporate friendly content etc.
And anyway in the last decade or more, there was a big push to say that "everything is political", you must always speak up for your ideas even in unrelated venues and spaces, etc., so yes it becomes very hard to delineate this because again, realistically, the problem is not political vs not political but my side vs their side.