Something you got to give to LinkedIn is at least that this is the default behavior (as far as I know, I haven't changed any notification setting since I got it)
It's great for someone that just want to have a "easy CV" so that recruiters at least know where/what you've worked with without back&forth mailing.
Recently I tried to get Twitter for the first time and my gosh what a mess that platform is. I only wanted it to follow some researcher to get up-to-date research topic but the damn app just have to fill the feed with "retweet" and other tweet I didn't even ask for (and I can't turn this off!)