I respect the security concern but none of what you are describing is how Facebook market works.

If you got a text message, it’s because you gave them your number that’s your fault. Nobody has the ability to contact you outside of the marketplace ecosystem or messenger unless you specifically allow it.

If you’re getting promotional messages, it’s because you opened a business chat with that organization.

I’m basically saying learn.

None of that has anything to do with not wanting to upload personal information to meta.