Oh, I've had that, too. I've interviewed with a few companies that create products that are literally years of research behind their (sometimes free) competitors. And don't realize, typically because they don't have the skill to even comprehend the difference.
And for fun, all these companies interviewed me on cloud development, rather than on their core offering, despite the fact that I actually happen to know a thing or two about said branch (i.e. I have both a PhD and commercial experience in the domain).
