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It doesn't work as a payment unless one uses the lightning network.

But there's a demand for that in the crypto space and BTC is slow, expensive and so on, the question is who gonna be the supplier?

It's not expensive if you use the lightning network or send large amounts. Not sure what you are asking about "the supplier".

Crypto payment is a demand, BTC isn't efficient though, therefore, who gonna be it? even XRP (not a real cryp) is better...

Not sure what you are not getting here. Go read up on the lightning network and then come back and talk.

The main argument was that bitcoin works as digital gold not for payments, but it can even work for payments using the lightning network or making very large transfers.

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