The most uncontroversial definition is that most or possibly all crypto assets excluding Bitcoin are unregistered securities, because they have teams that control them and can be hard-forked. Bitcoin is the only one that achieved neutral and impersonal status, resistant to being hard-forked by any person or group of people, so it’s the only proven digital commodity as Saylor and Gensler point out. Because of other crypto-assets being unregistered and unregulated securities, they should be approached with extreme caution at least and are probably not a great place to invest for normal people until regulation and proper disclosures come into the space.