When I first switched to Android, I was shocked to see Google's Photos app send me an ad for buying printed printed framed photos. After turning that off, I haven't noticed many ads.

Huh, I wonder if there's some I've just grown so used to they're a blindspot. I don't use google photos though...

Google Photos is always trying to upsell storage beyond 15GB: "(you're going to lose your pictures), turn on backup?". Even pressing the "Search" button got me that prompt once, with some blah blah that AI-assisted search only works when the photos are on the cloud...

The Play Store landing page is packed full of them - mostly scams.