I don't mind the fact that apps on Android show ads. I mind the terrible inconsistency of those ads. Some have an X button at the top left, some at the top right. I've seen "mute" buttons in at least three different quadrants, plus some are within a small landscape window rather than taking up the full portrait-held phone. And some don't have mute at all.

And then some have a fake-out X button that actually clicks on the ad if you try to use it.

And a couple of times I've gotten an ad that I literally couldn't exit. Had to force quit the app to get back to it.

If the ads were a consistent experience, I would have a much less intensely negative opinion of them.