You might have taken your email down now but you made it available at some point. LinkedIn scrapers cant make information that wasnt shared available. I'm not arguing that that means you opted in to receiving emails but if you made your email publicly available its odd to be upset when someone uses it to contact you.
The reason people circumvent LinkedIn could be cost but the cost of email tools are much higher than a LinkedIn Recruiter subscription and inmails. The reason people reach out via email is because it allows for easier drip campaigns/follow up emails, email template use, and the response rate is an order of magnitude higher.
I'm not trying to be an ass here. I'm trying to share the viewpoint of someone who is emailing you and why their intentions might not be as malicious you seem to interpret them.