Being a 3rd party dev in some ways is similar to being a streamer, just like you shouldn’t expect to start streaming and suddenly be the next Lirik, or Ninja, don’t plan to start working on Twitch apps/extensions and be the next StreamLabs and gamble your financial stability on that. It doesn’t matter if your extension idea has been done already, just keep at it and work on it out of passion rather than the hopes of making money. Stop trying to see it as a competition with the bigger developers.