There are many big players such as BlackRock, Grayscale, etc, but investors might be attracted to asset managers that have made their wallets public. We might see other providers join Bitwise and also seek other means to gain the trust of prospective investors.
They announce the data publicly, and it will not be difficult to track the flows, especially since they are in the thousands of
BTC and the data results are updated periodically, with a low possibility that these funds will commit fraud, especially since everything is subject to taxes and auditing.
The only advantage of showing the address is that it only helps in quickly detecting scam if it occurs.