Useless.
You can always sell a portion of your BTC to buy whatever in fiat.
Of course this card provides no technical benefits to other Visa-based cards, but to me that's never been the benefit of having these cards. In many European countries BTC purchases via these cards leads to 0% tax (as it's for a purchase), as opposed to simply selling to fiat and buying what you want. So clearly there is an enormous tax-based benefit in being able to purchase something with 0% tax as opposed to up to 40%. If you are based in the US, then probably these cards are indeed useless, but to others it could save a tonne of money if used wisely.
And also the fact that this is just an invitation only thing makes the whole thing a bit suspicious. I mean how are they going to know who to invite in the first place?
This is quite common to be honest, it's similar to Coinbase and others. In order to avoid being inundated with potential customers. Not that suspicious in reality.
Seems like some country wants their taxes paid.
Just sounds like Visa wanted a % of the profits from Visa-based cards, because they have been missing out until now.