GT Sport has a meager difference between playercount and actual sales (roughly 14 vs 13 million), in contrats to Microsoft's typical (extrapolated) ratio of like 4 or 5:1. GT Sport never made it into Playstation Plus, but I guesstimated it to have sold around 9 million copies at 14 million players (Feb 2022).
It's strange that Polyphony uses the "players" metric when the actual sales are very close.