Their aim is introduce some kind of alternative(like Libra) and ban the bitcoin and other crypto-currencies
That is possible, but Libra and Bitcoin are totally different so there's no way we can compare Bitcoin to Libra, but if that's the case, we can't force them not to ban Bitcoin.
Bitcoin is just being decentralized, and a better store of value for me. We should also appreciate the existence of Libra like there are many people introduce to cryptocurrency since Libra and people will notice Bitcoin.