But, 10% is a maximum penalty posted. For the instance [1] shows that in 2018 maximum penalty was 931k PLN (~300k $). Another case [2] shows that penalty can be easily deceased if subject is cooperating (-50%) and further more decreased if subject takes penalty without court.
At the moment CDPR has done something extraordinary that is: extended refund policy for the title. Forcing that also on PlayStation (and taking ricochet by pulling title from the store). Providing a few hot fixes for very very fresh product and stating future work in next couple of months.
I do understand that players on base PS4 and XBOX are mad. And in my opinion UOKiK can help taking their side. But with such a complicated case, where lots of players do play and enjoy the game (even on these consoles). The 10% penalty is simply impossible. Also I don't know if it's is at all, as there is the refund policy in place.
[1] - https://www.uokik.gov.pl/download.php?plik=24030
[2] - https://www.wiadomoscihandlowe.pl/artykul/uokik-pol-miliona-...
TL;DR; UOKiK does that as requested and expected from them, but is very unlikely that 10% penalty will take place.