The business model of linkedIn is a bit messed up. It pretends to offer something to you, the individual. Yet you are not paying for the site, so you are part of the product not the customer. The real customers are companies (advertising) and recruiters (self-described raw meat to be had). However, linkedIn seems to have messed up with that business model as well. Because recruiters wants recruits - not just a mailing list of people who are not interested. This leaves only the advertisers, thus turning even more recruits from visiting the site, therefore making the site less interesting to recruiters. A downward spiral, really.
Recent offerings of linkedin Learning seems to be attempts to mitigate this but at the core of the problem really is that the site offers very little value to recruits. Maybe there are some smart business model people around that could fix that, who knows. The space is ready for dis-ruption.