Earlier quoted context omitted.
Full reserve: > By fully backing each coin with a set of stable and liquid assets (described later) and by working with a competitive group of exchanges and other liquidity providers, users can have confidence that they will be able to sell any Libra coin at or close to the value of the reserve at any time. [0] They'll fund expenses from the return of the investments. > How will the reserve be invested? Users of Libr…
That doesn't sound like a full reserve though as its not 100% cash. It says right there that its partially invested in risky assets. Whether they're low risk is just an opinion. But even assuming it was a full reserve, I don't think its fundamentally different enough to be allowed to skirt the existing laws.
It's different enough from banks because its matched one for one with some asset. It's essentially a passthrough investment. The reason banks are so highly regulated is that they participate in fractional reserve banking where they take in deposits and invest in highly risky assets. That and deposits are guaranteed by FDIC or similar agencies.
Should Starbucks be regulated as a bank because they let you prepay for a cup of coffee?