The thing is, all the red flags doesn't really matter - every time you invest, you take the risk. Invest only money that you are ready to lose.
If the team is anonymous or not - doesn't matter either. Can you prove that "real" people are real without seeing them and their passports?
Will you trust me more if my name will be James Downey or Richard McDowney? Maybe Ahmed Dowennamad will make you trust in project more?
You ever heard about identity theft? That's quite common situation these days.
Who created Bitcoin? Isn't it the biggest red flag to it? But why it costs $3,7k now?
Getting advertised on Facebook means only one thing - they're putting money in advertising, that's all. Nothing more, don't try to find something else here.
VISA has no idea about this project? No wonder, they will collect the money, then pay VISA to get the right to issue cards. VISA is just the commercial system, they do whatever you want once you have money. Why they don't know about PlexCoin now - because nobody tried to talk to them without having money to pay for their service.
If you just want to get a card, you'd better don't risk and go for services that are already here for few years, there are lots of them. bitpay.com - they exist for few years already, MonaCo or whatever it is called - appeared not long ago.