LinkedIn decided to send me an unsolicited email recently. I immediately unsubscribed, because I have negative interest in receiving anything at all from LinkedIn.
Today I got another email. I followed the Unsubscribe link and logged into my LinkedIn account. There is a section called Notifications. Convenient!
It has a lot of categories:

That’s 11 categories–and several have sub-categories, each with their own notifications. You can disable all of them, if you like (I like this very much). What you can’t do, however, is just turn off ALL notifications at once–the option doesn’t exist.
This is LinkedIn, and by proxy, Microsoft, showing contempt for its users. Turning off all the notifications requires 24 clicks. 24! Absurd. This should be illegal. It probably is in Europe.
I’m now pondering whether to just delete my LinkedIn profile entirely, make it part of The Culling. LinkedIn is bad and should feel bad.