I have tried the virtual one once and I was able to pay for it using Lightning. There were no fees and the exchange rate USD <> BTC was exactly what my
LED Bitcoin dashboard (hitbtc.com API) was displaying (negligible difference).
Virtual cards are cool and all, but I am more interested in physical cards that can be reloaded with more bitcoin money and use in more places.
Even with real cards it happens they don't always work, but I would accept that if I don't have to go with all procedure of standard cards.
One more potential use case of this vitual cards could be anonymous e-sim cards from silent.link or some other provider.
As far as I know, at that point it was a video POC and it wasn't production-ready; unfortunately, I can't find it anymore either. Maybe my description sounds familiar to someone who can recall the project name.
Sounds interesting but I never saw any video about service like that, but I generally reduced time I am spending watching videos.