This is extremely weird because when the Sony-Netflix Deal was announced, I remember people saying that the titles were only exclusive for 18 months and then they could go to another streamer if they wanted and I immediately thought Disney+ was the obvious choice. I didn't think it would actually happen though!
Oh, and with Sony library content coming, i'm pretty sure that Star (or Hulu) will be integrating within Disney+ right around the time this deal starts as the Sony stuff has a lot of R material, too, along with Fox. Not to mention 2022 is when the streaming deal for Fox movies on HBO ends.
So i'm gonna firmly plant my flag that we'll be getting the R-rated content within Disney+ starting next year in the US.