This may seem odd, but why do so many servers require teamspeak or discord to join. I understand its to weed out the troublesome crowed. But i would like to just join one and see what redm is about.
Just depends on the server, just like FiveM is the exact same way.
Now, I dont see any issues with that because there might be information in the discord you should read. Discords are made to have valuable information for new players.