[cocoafleck]

I don't see any ads outside of the app store on Android (and obviously the web browser). Microsoft puts them in the start menu which seems very different to me (I would be very angry if Android put them in the launcher). I do customise my set up a great deal so I am curious to know if your experience matches mine.

[com2kid]

I get notifications pushed to me from Google Photos asking me to print my photos out and make photo albums.

I'll occasionally get an ad from Google books.

These can be turned off (notification channels), but I'm assuming most users don't know how to, and they are certainly on by default.