All Commonpass seems to do is take your results, upload them to some part of the internet, then give you a QR code to access some or all of that information (the article isn't specific on those details). They frame this as fixing the problem of standardizing test results, which as far as I can tell was never a problem to start. I don't see why governments really would want or need this instead of the current paper test results, assuming that they let you fly at all.