Maybe because it's backers are withdrawing from the project and Facebook's prime market US doesn't like Libra's concept.
For the use of remittance, bitcoin could still be a good option. Though it's fee seems large for small transactions, it's much better than swift fees or western union fees for sending remittance. There are other options like lightning network or the BEP2 token from binance but it would depend on the parties involved more than the choice of currency.