Bitcoin was at $61k as at the time of Maguires signing, today its half that
Maguire has been a colossal failure at United but I don't think Unite would have made profits too if they had bought Bitcoin with that 80million euros in 2019.
The difference is, Manchester United would have still made profit in future with their bitcoin investment, but they would get nothing from Maguire. They never did, they never will.
Just think of Maguire as a bad investment. It happens everything, even to the best of us.
Personally, I feel Maguire was a better investment for Man United than Hazard for Madrid.
You are right that Maguire isn't as wasteful as Hazard. Bitcoin is an asset that keeps increasing in value as time passes by and it has a volatile nature,which makes it superb. Properties and human depreciates in values as time goes on,that is why investing in bitcoin in 2019 with that amount will be more profitable than investing in Maguire. I believe that this club managers sometimes don't know that such player will decline in performance in a very short period. That is why it is good to buy the players very young,we are only humans and wouldn't be able to look into the future.