No, no they are not made on github. That is preposterous. A framework is set up beforehand and ideas are discussed before they get on Github (might not happen in slack, but does between those from slack), which is understandable and is the case with all and any change with any project, otherwise there would be a lot of wasted time.

conspiracy theories

Not a single conspiracy theory.

Unlike Steem, there is no King Dick called "Ned"

Sure, but there are many "Baron Dicks" as we just saw with the CF drama.

Seriously, make an effort before coming to unfounded and totally bogus conclusions.

Not a single thing i said is unfounded, its highly logical and can be seen world around when it comes to any societal structure. There is always a core group of people in any and all organization and these structures always lean towards centralization.
Hive the blockchain might be decentralized but "the slack" in relation to the wider community is a centralized point of power. There is no denying and you can twist it any way you want. You can call it "necessary" like guilty parties did in this post but its a fact.

Im not here to criticize its existence. That would be silly because i realize its necessity. Im here to criticize actions of the individuals in it. Their unfair behavior among other things.
All in order that it gets improved over time.

I have no horse in this race outside the wish HIVE "does better".