It is, they’re darkpatternmaxxing.
There used to be a time sites got punished if they treated searchbots differently..
The answer is not to sign up to X, but to learn to suppress your FOMO. Chances are it was drivel anyway. Especially true for LinkedIn.
Like I get why they probably changed that. I suspect all the attacks from media outlets on Google for requiring their articles to be paywall free to rank in search likely had a big effect here.
But it should be simple. If you want to rank in Google, your pages should be visible to guests. If they're not, those pages don't rank at all.