I don't know if I'm wrong, but I have the impression that when US Treasury bond investors want to invest in another thing, like cryptos, they prefer BTC for the medium to long term
I don't think the treasury bond public is the same as the one that invests with the risk of DeFis (hack, risk of smart contracts, rug pull etc)
In addition to BTC, they can also invest in ETH, and with ETFs this audience should feel even safer about investing in cryptos
They'd rather invest in a blackrock than an AAVE, for example