There is no way to know who controls the market, I believe that the level we are today would have to be a joint action in order to have some influence on the flow of btc.
who benefit from cryptocurrency are all of us investors. because business people who use crypto will definitely enjoy the benefits by being given convenience in every trade, so crypto is for anyone and for all who want, so no one group can control the market all will have a share in crypto.
All of us we can manipulate the crypto market if we really want to do that, because we are not only user we are also a investor that can cause for the bitcoin to rise and dump. Everyone will get benefits once the market rise because they will sell their bitcoin if they want.
But if you are billionaire maybe you can control your market but only a little flow only because if you have big shares once you sell it price decreaswe but better to invest more instead of selling.
Probably we could do that if we're like those whales who had that huge profit to used for manipulation, but if we don't just closely monitor the market and be silent about it. The big whales can do whatever they can as long as the market remained actively driven towards trading capacity. I think we've been benefited by cryptocurrency once they've been taking over the market price increase so all of us who had small asset grabbed the opportunity, while those whales definitely took the command for price increase manipulation. We're just small fish, and it not possible to take in effect to which we buy some portion which the bigger ones will have.