But they're kind of weak as implemented here. Considering that a photo of a vaccine card is considered valid proof (and the guy checking cards at the bar or whatever is only going to spend two seconds looking at it), some enterprising scumbag could probably whip up a site that automatically creates fake vaccine pass photos over a weekend or two.
*Even with delta, the vaccines are pretty damn effective at preventing infections. A lot of media coverage on this is misleading and is based on not understanding base rates - when a high proportion of people at risk of hospitalization are vaccinated, you're going to see vaccination rates among hospitalized people that are higher than the actual efficacy rate would suggest.