I think there is no cartel of bitcoin! Why I can say like that?
You can read this first :
A cartel is a group of apparently independent producers whose goal is to increase their collective profits by means of price fixing,
limiting supply, or other restrictive practices. Cartels typically control selling prices, but some are organized to control the prices of purchased inputs.
Source :
WikipediaFrom that definition, we can make a conclusion if cartel manage the supply by Limiting the supply,
I think nobody or no company/goverment can limiting supply of Bitcoin.
As long I know about bitcoin and learn more about bitcoin, I just seen whales which like our friend say before. They can influence the price but they can't manage the price!