They have been getting more and more into Bitcoin for a while, when Jamie Dimon despised it years ago.
Forget about Dimon, he is irrelevant, we know why and what they did that time.
2.5% of billions of dollars could be a good start for Morgan Stanley. And I'm assuming that there could be some banks already offering this kind of service during last year super fast rally. And then more are thinking specially when Elon Musk and his company investments. And obviously it has a trickle effect already. And the price seems to bounce back to $58k right now, perhaps this news is one reason of the current spike.