Big players like LinkedIn, Facebook, et all play by different rules. Losing LinkedIns results would damage Google.

Half the reason I use Qwant is it works better than LinkedIn's paid search results. Google does much worse.

The content is pretty much the same if you log in. Google doesn’t seem to care in instances like this, I’ve worked on multiple very large sites that do the exact same thing (further in so e instances: present a JS app to users and a faster JS—less experience to google). Many news sites do it too, for example.