Ditto the "centralization" purity test. No decentralized system can fail ergo if it failed it wasn't decentralized. This doesn't apply to FTX of course which was more centralized than a black hole and never claimed otherwise - but it's another instance I've seen tossed around in the collapse. The truth is nothing in crypto is really decentralized, though, and decentralization isn't in and of itself a useful end. It's a means to an end nobody's discovered yet.