I've seen many "HN for X" projects for various niches now, and they all suffer from the chicken/egg problem of getting a critical mass of participants. Isn't game development already discussed here? I actually built a side project that categorizes front page articles so I can filter for topics. Here's an example for recent gamedev content: https://www.kadoa.com/hacksnack/d57360e8-1eb1-4800-a711-f0d5...
By limiting the surface area, it’s bound to never become larger than the restriction.