"I'd insist to not star Adam, because it is somewhat distracting from the message of my startup. He is basically everywhere, and it sort of gives me a strange (but negative) sensation of devaluation of the startup. Am I the only one who feels this way?"

That seems like a very inside baseball concern. I really doubt your typical consumer has any memory of the actors in a typical consumer web product video. I mean, going through this list, I've seen a lot of these videos over the years and didn't realize they were all made by the same people until it was pointed out here. I'd also venture to guess that he appears in a lot of them to cut the costs of the video. More people involved in making a video means higher costs.