I couldn't care less if they're paid or not. The only difference is I'll definitely skip the talking if they are, compared to most likely if they aren't.
Well, “paid” is a relative term. Folks also get gear to keep which is payment. They can sell it or do what they want after the vid. It’s still compensated.
I know many people prefer this format, but I've never liked cell phone videos of expensive amps. It's an expensive amp, and there are many natural-sounding mics. It's not that hard to mic a cab. It's not like cell phone vids give that much of an in-the-room vibe either.