GIGO. Which makes me think that the actual functionality/utility in LinkedIn (of which I am not a member) lies elsewhere.
Years ago, recruiting advice was insisting that a LinkedIn profile had become necessary. But even back then, the configuration / data sharing they insisted upon, and worse, the reporting on some of their bad (from my perspective, and also others') behaviour was just too much for me, and I stayed away.
I imagine much of what one gets through LinkedIn is akin to much of what one gets in the rest of the corporate world. A lot of BS, and you left at your own discretion to discern the truth -- such as it is and is reflected in that environment -- amidst all this.
P.S. I'll add that LinkedIn seems to have become a poster child -- albeit a lame-assed corporate one -- for "dark patterns".
But, the thing they do that really bothers me, is to ask people endorse me for things, in a way that suggests I asked to be endorsed for those things. But I didn't. It just found words related to those in my profile. And people who like me or want to be helpful click OK to endorse me for shit that I have nothing to do with. Like ASP.net.
I just don't like that it makes people think I asked to be endorsed. For stuff I don't know and don't do.