Binance and Coinbase are two of the largest cryptocurrency "exchanges" (shitcoin casinos).

Prime Trust is a cryptocurrency custodian which (allegedly) holds ₿ and other funds on behalf of various institutions (exchanges, etc) for the customers of the exchanges, etc. They hold IOUs for the places that hold IOUs for retail customers.

Because they all seem to be "investing" (or speculating with) customer funds (and, legitimately, due to the inherent difficulties of holding large amounts of cash on demand) — these are all subject to similar concerns as banks with regards to the risks of "bank runs" (where more customers demand withdrawal than they have as liquidity reserves).

Basically, more fractional reserve and hypothetication bullshit.