OP, although institutional investor can buy 1%-10% of the total circulating bitcoin supply, I believe they will not be able to control it. So far I have seen the involvement of institutional investor in bitcoin investing as a big support, but at the same time they also want to profit from rising price. Institutional investor will not stick with bitcoin forever, they may still sell some of their bitcoin when the need arises. Bitcoin is a decentralized asset, so there's no way it will only benefit a group of investor.
Cryptocurrency has not even become completely legal in the world, and therefore it and the participants in this market still have many unresolved problems.
Cryptocurrency trading can be considered a legitimate activity, at least not many countries prohibit bitcoin/ cryptocurrency trading in their countries. Bitcoin and its users must also comply with local regulation if it is to be used as a currency which is currently illegal in some countries.