I have a LinkedIn account and I occasionally have recruiters cold phone call me. They always tell me they got my phone number from LinkedIn. The first time this happened I deleted my number off LinkedIn, which was not shared according to their settings but was being used for 2FA. I still occasionally get these calls, and I'm unsure if LinkedIn is still letting people buy access to my deleted phone number, or if the recruiters are just lying and getting my number from some creepy stolen data service.