Grinder surely made much more from data sales than the 6.something million Erous it was find. The paltry fines under GDPR do nothing to dissuade this behavio. That's been a recurring theme in previous HN discussions on this topic.
Right now, I would posit that these low penalties are for show. Governments don't want to lose the economic benefit of having these companies operate in the EU and the general public can be satisfied that their governments are on top of the issue.