For me OneDrive “memories” are from my wallpaper folder or Xbox screenshots.
Google “memories” are food diary photos (on days when my food budget is spent, Google loves to show me photos of the massive pizzas I ate years ago, because it knows) or random sunsets. (Except for that photo collage with cheery music from my grandma’s funeral. Why did it have to do that specifically. Just asking.)
[old woman memories mode]
I remember registering my CD key of HL1 on Steam and was surprised when they gave me the expansions for free. Cool, because I didn’t have them.
I remember buying The Orange Box on Steam. I remember it because Steam gave me a warning because I already had Portal - it was free at some point. Was a bit miffed when TF2 went free to play later on.
And I somehow still haven’t played HL2 on Steam, I think? I played it about 1/3 way on Xbox 360. Played the shit out of Portal on 360 though.