Most software developers would be happy to have 'too many' beta testers. That's where you get a bunch of regular users that aren't in your mindset to bang on your product and identify usability issues, broken code, functionality, etc.
It gives you an opportunity to recognize and fix problems before release.
Sure, people are going to bad mouth you, or have their own 'vision' of what your product should be, but they'll do that anyways for the demo and the initial release version as well.
Perhaps these 'special' game developers should simply forego all beta and QA testing and simply release their code as they see fit and wait for the accolades to pour in. Because, obviously, the testers are ruining their work.