This thread is headed by defensive comments alleging that they have benefitted financially from LinkedIn.
These comments only strengthen the premise of the OP that "toxic mediocrity" is rewarded.
It is like a submission that is critical of multi-level marketing that generates a stream of defensive comments from marketers alleging that MLM "is responsible for millions of dollars in revenue". Of course it is, but that is not why the author of the submission is bothered by it.
Fortunately companies are comprised of more than just marketing departments. For many folks, the appeal of their employer, their job and their work is found in those other departments. IMHO.
The OP is not trying to engage in LinkedIn marketing. He is complaining about being on the receiving end of self-made internet marketers.
It would be one thing if the OP claimed "LinkedIn marketing is not effective". The OP does not do that. He claims LinkedIn marketing is "annoying".
This thread (so far) contains zero replies rebutting that claim.
Who is the company behind all this toxic, mediocre marketing and data collection about LinkedIn members to produce more internet advertising revenue, among other things. According to HN commenters, it's the "cool guys"^1
https://news.ycombinator.com/item?id=44866666
That is but one example of many, many HN comments going back years (part of an ongoing HN meme) presuming that Microsoft has "changed" (I could choose any of them to illustrate, but this one has a nice ID number with lots of sixes)
It's true. Microsoft has changed. It is even worse than it used to be when it was considered very bad
HN commenters trying defend Microsoft may attempt to divert attention away from LinkedIn and blame self-marketers, i.e., computer users. That would be nothing new. But both the OP and the HN title specifically identify LinkedIn. The problem is the so-called "tech" company that acts as an unnecessary and irresponsible intermediary, not the www users they usurp and target for profit.