I mean wouldn't you? He's built an app that brings him a decent income, he can work on it full time, he based his career on that application. What reaction would you expect out of f.e. youtubers when youtube made it suddenly unable for them to sustain themselves? I mean basing your life/income/business on another business is never a good idea, but this is how a big chunk of the world works. I think he has all the rights to be angry about it.