https://www.coindesk.com/crypto-custody-state-street-is-waiting-on-a-client-shift-exec-says
I think that for individuals that are holding bitcoin, custodial services simply don't make any sense. Even for long term institutional investors, it is much better to hold the private key to the bitcoins instead of trusting someone to safeguard it.
Obviously, though, they are targeting the institutional investors who need to trade bitcoin and derivatives on the short term.
In that case, I don't really see any reason for there to be any demand yet, given that the bear market is still going and that institutions are only looking into bitcoin and taking it as a serious investment possibility over the last year or so. In the future, there could definitely be more demand for these services.