Do not advertise for other servers. I think that rule is too hard. If you tell someone: Let's do a 1o1 on server "abc" or Let's play the gamemode xy on server "dgk" you break the rules. I think that is just a problem if you say: DRC is a bad server and server "hjk" is much better. If you just ask someone to play an other game i see no problem, because they dont leave DRC forever. They come back later to play the DRC gamemodes. If they play on other servers they maybe get new friends and they play with them on DRC later. You can also tell someone the ip on ts, skype or apps. You just need longer.