They're all just geometric shapes that anyone could throw together. Really, you're pretty damn lazy or uninspired if you can't put together a stop sign outline with 2 circles on either side of it!
Do you realize how many company logos are just the Helvetica font? You can't get any more basic than that. When you're just getting started, especially a one man operation, anything to get your product up and running quicker is a good thing.
Yes, but thought, money, and man hours went into them. They didn't just grab rejected logos from the "commodity" bin, which is what we have here. Seriously, if you can't put some design effort into your logo then something's wrong.
This form of criticism is along the lines of "The Gettysburg Address is just words anyone could write." The important part of creative work is not the potential but actually doing it. There's no such thing as "a design in my head."
Don't get me wrong, I'm not claiming that the logos are cultural artifacts of high calibre. But that what they share with such works is actuality. Their creator can get better in ways that everyone who could but doesn't can't.
I could not throw anything together of this quality. If I were to create a product by myself, using one of the ones available would certainly be a step up.