The big bank still not support bitcoin in general, but they raised their share in the MicroStrategy. Now Morgan Stanley has more than 10% of the company’s stocks. This is almost a 300% growth since Q3 2020. Papers of MicroStrategy gained 37% since august after they announced BTC purchasing. On the other hand, SP500 increased only 1,8% in the same period.
Not all companies let themselves to flip some money into a brand new, relatively unknown risk-asset, especially banks not. Even if they could invest through Grayscale, which is a regulated, trusted, known fund. But this kind of move is a clear sign, they want to do this.