> But generally in banking, cash and cash-like products are equivalent.
Except it's not. Well, maybe it is "generally", but fractional reserves in particular are, by definition, central bank money, and only central bank money. So, strictly speaking, cash or central bank deposits. Not bonds, not loans, not equity. Only central bank money.
> It's different enough from banks because its matched one for one with some asset.
In other words: It is exactly like a bank. Every loan any bank ever makes is matched with some asset, if it weren't, they'd be called gifts and not loans.
> 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 doesn't even make sense. How would the fact that a bank has (supposedly) lower reserve requirements mean that "regulation" is required more? The whole point of regulation and oversight is to make sure that the minimum reserve is there, not that there isn't too much reserve, and if a bank supposedly had a 100% reserve requirement (because that is what they promise their customers, say), that would , if anything, make it even more important to check that that is actually true.
The whole reason why all of that regulation and oversight exists is not because banks have promised their customers too little, but because banks over and over and over told their customers one thing, but actually did something completely different, and ususally that means something a lot more risky.
The fact that Facebook promises to do something really good is exactly zero reason to do away with mechanisms that exist to make sure that promises are held.