It will say in sv_registration_message. But quickplay doesn't matter for non-official servers anymore. The amount of players you get from it is negligible now because most players pick the path of least clicks and community servers get a fraction of the screen space and convenience that official servers do.
Valve probably knows this. There have been more servers that don't belong on quickplay such as randomizer that aren't getting removed. I have no doubt that they have been reported, but since so few people use it anymore they probably ignore them now. Community servers have been segregated into their own ghetto so Valve doesn't have to worry about policing them anymore.
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