The question is simple: CENTRA is a scam?
I think they are good, and I would wait for them to launch their cbay (I think that's how they will call it). There are a lot of crypto cards already, but the ones operating in the blockchain are still not very popular, like centra, tenX, monaco. They are a much better option than the ones that are dominating the market right now, like xapo, cryptopay, etc. If you have the token, I would say hold to it, and probably get the card as well to generate some more.
These cards are a very good solution for adoption right now, and I think they still have an important role to play right now. They will be "useless" in maybe 10 ou 15 years for now, if bitcoin succeeds, but for the short term, they are the best solution for people to pay with BTC.