I always get recommendations on the Play Store for World of Goo, an amazing game from 2008 that you can now only play if you're a Netflix subscriber. The 1.7 star rating has convinced no suits that that might not be what people what.
On iPhone I used to use Frame Grabber all the time. It was free and the full source on GitHub. They sold the rights to a company who now charges $20/year for the same thing. No ill will to the original developer, but jeeze. $20 to get a slightly better quality frame from a video vs just screenshotting your phone? No thanks.