Good to know, makes me consider closing my account myself. Linkedin always had a bit of a scammy feeling to it. Especially when it comes to recruiters' spam messages.
I did that maybe 10 years ago and haven't had a single opportunity to regret.
Like you, I'd thought I had a good run without it.
More recently, I noticed that some of the people who were way junior to me earlier in my career, are way ahead of me because they were strategically switching jobs every 1-2 years. After speaking to some of them, the common factor turned out to be LinkedIn, and I begrudgingly rejoined it in January.