decentralization and trustlessness I would say are the big two.
With Libra its pretty clearly controlled by large tech companies so validating on the network isnt open to anyone. This means it not decentralized in my book. You also have to trust that the dollars or dollar equivalents are behind every token on the Libra network, this isnt the case in bitcoin/ethereum since there isnt an attempt to use dollar backed tokens at the base layer
It feels like a defeat, though, to have the word cryptocurrency co-opted by things such as this. Wouldn't it be easier to call this bullshit, and decentralized currencies cryptocurrencies? /s
i actually think the term is accurate. cryptocurrency = currency based on cryptography. we need a different term for "decentralized/trustless currency"