I would say that Scott is not a reviewer, he runs a bass educational website (which is very good). I think his spamming is excessive, but that is probably why I have nothing like the money he has made, and you don't actually have to watch it. The only way you would see his spam is if you signed up for it (which you can unsubscribe from), so not sure what the problem is.
I don't like those videos he does, but then I don't watch them so it isn't an issue. But I do watch his paid content, and he also puts out a lot of free content which has value.
If I wanted a review of a bass though I wouldn't watch him, there are plenty of people who do it. I like andertons, even though they are a company, because there videos have quality, they are interesting, they show you the thing they are reviewing and talk about it, as well as showing you all the controls and sounds in several different styles.
It is pretty hard to do a decent video, which is I guess why most people don't do them.