“Fittest” for what? For example, more educated people have a higher chance to suffer from a mental ilness. Do you think that humanity is better off if only idiots remain?

I agree, but after I tried three FOSS ones that were hard to set up and had very bad voice quality I gave up and tried Guilded which is working great. The most important feature I need is ability to locally mute people which not many apps have for some reason. What would you recommend I use?

Guilded is really similar to Discord, but Roblox bought them so you need a Roblox account to use it. It’s great for voice chat.