Could be in theory, but has it ever been? I think about the biggest was a 1.2bn fine on Meta by the Irish regulator, but that's only about 0.5% revenue.
EDIT: Oh, actually, looks like Uber was fined close to 2% by the Dutch regulator recently.
The current fine isn’t a fixed value that’ll just be applied every time. As per the article:
> In case of non-compliance with the decision, Fnac Darty faces a daily penalty of €10,000.
And if they do it again, that is very likely to be taken into consideration into the next fine (or other actions).
In other words, it may not be sufficiently punitive but that doesn’t mean it won’t be dissuasive for them to continue. But sure, if you think they should’ve been fined more (and I agree), consider donating to noyb so they have the resources to fight more of these cases harder.