Wow, you got flagged for that?!
Some rule “enthusiast” definitely went overboard here. Your original post was not overtly “soliciting or advertising” weiqi.gs, unlike Yunxuan Li’s promotion topics for his Youtube channel. Those are still there. You just informed us about and called for discussion of this new server.
Should ads be forbidden in this forum? If they are spammy and from users who do not participate in our community, yes. It’s a case-by-case judgement call.
Why are ads for “competing Go services” explicitly mentioned? Probably because those are much more likely to be posted here than elsewhere due to the player base also being the exact target audience.
If anyone thinks along the lines of “we don’t want people to learn about those other services because they might leave OGS and not donate any more”, that is the absolute worst reason to have such a rule. Apart from the blatantly deceitful anti-user sentiment, OGS can stand on its own merits without resorting to disinformation. Even if it could not, such motivations are not helping KGS right now with the drain on its user base. Think about it.
Things like these are what made me dislike and leave KGS (and other places on the internet). Fortunately, OGS is still a very free and open-minded place. Mods, please un-flag @yebellz’ post for the sake of my sanity.