TBH, Bitcoin is more of an asset than a currency.
Depends though, maybe there are people using it as a asset and then some passing it as a currency for cross border payments, which I think was one of the reason why Satoshi created it in the first place. So what the report says could be happening already, as you can send bitcoin or even other crypto's across the border. Specially in the sector of remittances, wherein crypto will shine the most.