Yeah, it's one of those things where it's not a big deal if the audience sees it for what it is, because in that case, the company is getting out of it what they put into it.
What sucks is when people are so conditioned to expect a particular aesthetic or asset class (as with corporate memphis) that they just ignore it anyway, effectively justifying going the cheap route. "If our customers don't care about our illustrations anyway, why would we pay for custom ones?" If your illustrations don't matter, why are you using any in the first place?
> "really bad stock photo"
Ironically, really bad stock photos usually come with a licensing fee.
While I appreciate people putting their work out there these illustrations are poorly done.