Yes — I (as somebody who posts to promote my startup) wonder what the true goal is sometimes, as it’s ambiguous.
Certainly target customers and industry peers, but probably recruiters and VCs too.
My interpretation of how a very experienced recruiter once explained it to me is:
It’s “public life” online, and your public persona (in a “The Fall of Public Man” sense), and if you have no presence or a minimal one, when the time comes that you NEED attention (job seeking; shilling your business) you won’t have any listeners due to the algorithm.
Therefore one must constantly be telling the LI gods that they are an active user by posting perfunctory mediocrity.
It’s algorithm-gaming and cosplaying as a table-stakes activity for being “seen” or acknowledged to exist.