Google's annoying 'update ownership' sideload warning spreads to more apps and phones

I'm not real happy with how scary the warnings are for sideloading apps, but I think this is different. In this case, it was installed from 1 place, then updated from another. I think the user needs to know that, and that it might be undesirable. And it doesn't keep warning you about that app afterwards, either.

Is it really that annoying or is this an exaggeration? Per the article, the warning appears only once.