Facebook has already been fined under the GDPR so it looks like that enforcement is working.
If not that's an excellent example and it may lead to FB being held to account.
DPA's typically do not go on fishing expeditions, you have to alert them.
If you have any sources for this fine, please post them.
From noyb's fight against Facebook (https://noyb.eu/en/open-letter), to me it is very clear that Facebook does not intend to comply with GDPR. They are actively trying to find loopholes, and according to noyd, also working with the Irish DPO to find and exploit loopholes. It is also worth noting that the total fines Google has faced from GDPR enforcement come to just under EUR 58 Mn (http://newsbreaks.infotoday.com/NewsBreaks/GDPR-2020-Where-C...). 58 Mn is chump change compared to Google's total revenue, and unless the threat of the full 4% turnover fine becomes credible, I doubt it will lead to any better action.
Facebook, Google, Apple & Microsoft are arguably the companies that stand the most to lose from GDPR enforcement, you can bet that they are well aware of this.
https://www.enforcementtracker.com/
Facebook has already been fined, and if they cross the line again they will be fined again, and quite possibly much higher.
If you know for a fact that Facebook is in some way or other currently not GDPR compliant then I would invite you to contact your local DPA.
