I recently started to receive emails with:
"New skill available: Puzzle solving"
Begging me to compete with colleagues. Oh, what they have become...
I have unsubscribed from their emails now.
I'm willing to bet that "Daily Active Users" is one of LinkedIn's H1 OKRs. Putting a daily game on the site earned an SVP a fat bonus.
Good luck actually unsubscribing from LinkedIn emails. The dark pattern they employ (or at least used to employ, for many many years) is to just periodically add new "categories" of email to send you, that you haven't yet unsubscribed from. Back in ~2015, out of frustration I changed my LinkedIn email to a throwaway
"A [recruiter you connected with 3 years ago in hopes of getting job opportunities, but never heard from ever again] reacted to a post by [a person you've never heard of before]: What taking a long shit while my wife was screaming at my kids taught me about b2b sales.
Click here to read more"
When I see connections are wasting time playing LinkedIn puzzles I'm just embarrassed for them. Although I half expect it's just made up for engagement like fake profiles on dating sites.