That doesn't make it acceptable.
The people who fund, manage and work for these types of companies should be blacklisted in the industry.
Probably. But it's long exactly because people are not willing to blacklist as much as they should.
The market is under no obligation to respect you. In fact, competitive pressures push everyone towards exploiting you as much as it is possible. So the limit of crap we're being served is the same as what we're willing to endure.
Yes, LinkedIn is well known for essentially spreading itself like a virus with a bunch of interactions unknown to the user and that's exactly why no one should be using it. If I see that someone has a LinkedIn profile it's pretty much a minus nowadays.
Just saying.
I have all @facebook.com email on blacklist on my email server because I get daily spam from Facebook trying to get me to spend more time on the page, even with everything turned off.
If I am building a network driven product like a dating app or social network, you better be damn sure that it is going to be using 'growth hacking' (read:scraping) methods to increase the viral coefficient per user.
Would it also be news to you if I told you that 719 singles in your zip code did not, actually, want to see you tonight?