LinkedIn is absolutely atrocious for sending unwelcome emails. I actually filter them all, at this point I’m motivated by pure spite towards the kind of companies that think they’re entitled to my attention as and when they demand it.
If I want to know about things on LinkedIn I’ll look at LinkedIn, I don’t need their crap in my inbox too which is 80% irrelevant rubbish anyway. Email has the worst signal to noise ratio of any modern communication systems in use today, I’d send it the way of analogue TV if I could.