Well I don't know...
Because the garbage posting is actually encouraged by LinkedIn.
Not just "the algorithm", but LinkedIn's peoples themselves.
At work we had a 2h workshop with one of their "something something engagement".
They basically told us:
- post content at least every other day, use AI to help you produce it
- like every post of your coworkers to give them visibility
- post comments on customers/partners posts to maintain engagement, use AI to help you produce them
Everyone should constantly put garbage there so others can promote it so... nobody reads it because it's garbage.