Recruiters have weak messaging. That's their main problem. There are many types of mistakes they make and often have the sales mentality, using fluffy speak and mainly trying to get you on the phone.

The main reason is still very weak calls to action that don't speak to devs. That and they typically can't speak the lingo and resort to buzzwords. Much of it is very spammy and shows no personal attention, bad apples spoiling the barrel

I'm reachable via LinkedIn if you're saying something worth listening to. If I get cold notified of a random job opportunity at "Indian Consulting Company", I'm sorry, I am not going to respond. The likelihood I want your job is next to 0.

If someone from Google does the same, I'll probably give a response.

Your poll and the answers don't really align. You can have notifications disabled and still be reachable. Some people choose to manually check things. I have many apps that I disable notifications on and still check in on a few times a day.

Notifications should be opt in, so I usually disable them immediately. Linkedin is especially bad with spam and the "do you know this guy?" If I knew him and wanted to add him, I would have already.

I deleted my LinkedIn account :-)

It's been at least a decade since I deleted my linkedin account.