alt Hacker NewsI feel like this might be intentional to a certain degree, at least on YouTube or Facebook.
If you switched off the app while looking at a certain post or watching a certain video, that's a negative engagement indicator, so the app wants to throw you back into the algorithmic feed to show you something new instead.
Conveniently, if you're watching a youtube video with an ad, switch apps and youtube reloads, you have to watch the ad again