alt Hacker NewsAndroid user here, switched from iOS (not because of ads, a different gripe).
Not going to lie, it's a holistically bad experience, very similar to iOS in this regard. But Android doesn't show ads. The closest thing would be the Google Photos pestering to back up to cloud, things like that. It's per app, and usually there are better apps to replace the offending ones. (And vendor garbage can even be uninstalled, although it's very deliberately inconvenient to do.)
Bonus points for having Brave browser with built-in adblock, for the free YouTube Premium-ish ad-free experience.
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I guess you can disable or uninstall Photos but I don't know anything better so I'm currently ignoring the nags.
I was horrified about how many ads my wufe has on her iPhone. I mean web ads in Safari. It's unsusable.
It's worse than that. Google Photos sends push notifications telling you to buy photo books and prints unless you opt out. Play Books also sends push notifications telling you to buy particular books; it's also opt out. I'm semi-certain other built-in apps like YouTube and the Play Store do the same. However, once you turn all that junk off, the Pixel experience is pretty good.