When you are programming in some lesser known graphics frameworks like libgdx or when you are using OpenGl then the special Reddit subpages are more active than stackoverflow. For example I implemented a framebuffer in OpenGL wrong a few weeks ago but the output then is just a black screen. Some redditor mentioned that specific thing in a comment on /r/OpenGL
The real problem is how incredibly hard it is to set edit the hosts file on mobile. At least without using a VPN app or something.