I had something similar happen with a Chinese learning app. First week everything was fine, get an add every 20-30 minutes, no biggie. App was well organized (all info in it is easily available elsewhere), so I was okay with it. Then an update happened and I was getting full screen 10 second ads 2-3 times a minute. They would interrupt games where it was speaking at you (you get docked if you click for a second listen). Clearly this was a bug, so I messaged the developed and they got hostile (nice in the playstore response though) and told me if I didn't like ads I should buy their ad free one ($10 per app (I'd be happy to pay that for all 6, even a little more)).

Not one for dark patterns, I'm happy to say don't use the Chinese HSK app by Around Pixels.

I just don't get why this behavior is becoming so common. I don't understand why advertisers would support it either. If someone is clicking on your app only because they did it by accident (like this app frequently caused me to do), that's going to make the user also frustrated with your product. Supporting this behavior is actually harmful to your product.