It is cash like in that if you typo the destination address you instantly lose all the money, which is sort of like how you can accidentally set cash on fire.
Who types destination addresses by hand? Probably the same people that expose a hoard of paper money to flames?
Which is stupid, because Bitcoin is THE number 1 crypto, but for some reason they're all claiming it isn't.
Cryptocurrency folks do sometimes take the open source Bitcoin code and make small (or large) changes to it in order to do their work. When they do this they create a separate codebase, separate network, and a separate currency. Almost inevitably they do so in such a way as to greatly benefit themselves and to fool you.