I will forever mourn the general demise of server browsers. Too many games require you to use matchmaking systems, which means it's very hard to build up a small community in-game anymore. You either have to rely on forming small parties with people you've stumbled upon one by one, or you have to seek out people from some much larger area like Reddit or Discord. It takes a lot of the serendipity out of the experience…
It's been many moons since I was into gaming, but back in the RtCW [1][2] days there was a bunch of regulars that played on a server run my (IIRC) Charter. There were many servers in the browse list, and I'm sure many had a community of regulars just like we did.
[1] https://en.wikipedia.org/wiki/Return_to_Castle_Wolfenstein
[2] A Linux client was actually released, which is what I mostly used. (Actually running it on FreeBSD's Linuxator.)