You mean, besides about 100 or so banks and trans-national corporations, including Facebook itself, that already exist? But yes, surely banning one more cryptocurrency out of over 9000 already existing makes huge difference. Not.
> Given the power cooperations already yield this is a _good thing_ in my view.
You view seems to be "corporations have too much power, so any action that hurts any corporation, even if it doesn't change anything and does not improve situation in any way, is good". This is not a very sane approach to anything.
Comparing it to the toy money that existing crypto currencies are is likewise entirely irrelevant. It's structurally different for one, as Facebook et.al. would back Libras exchange rate. It's also backed by enormous economic power: