Agreed and amplified.The question is, who is checking, how do they check, and who cares. You can't legally get my health information, so how is my vaccine card™ a "fake"? It's almost the better alternative for show until it's done away with for being so stupid. With such a card, you don't at least have to pay some idiot bureaucracy 50-$100 to test "negative" for a disease that doesn't even do anything anymore, and never really did.
Go a step further and only keep a "photocopy" of your "legitimate vaccine card" on you.
"I hear these things are being stolen and sold on the black market. I don't want to lose my original, so I carry a photocopy with the information on it."
Bonus points if you black out the "shot" information, because you know, "If I lose this photocopy, I don't want anyone to be able to gain access to my medical or banking stuff by using the information on the stolen photocopy."
* this is after you've done everything else you can to avoid showing the fake card for the fake virus to gain access to something you absolutely need and cannot get anywhere else for whatever reason.