> I deleted my LinkedIn account because it's not useful for computer science fields (I think). I didn't want spam anymore.

I've never had a LinkedIn account, it has not stopped them spamming me regularly.

They seem to harvest contact details from people who install their apps, and then "invite" all those people. They then proceed to send dozens of reminders hoping the recipient will cave in to make it stop.

LinkedIn is a company I would like to see burned to the ground. They are parasites with no redeeming qualities and do not provide any value.