Yeah. I think while not nation-state-secure, you can still improve your PII exposure to Facebook/Twitter/Google et al by buying/activating a SIM/phone-number and only using it one time for the purpose of creating an account.

I don't _think_ Twitter or Facebook are doing backroom deals with every prepaid sim vendor to be able to tie that phone number back the the identity used to register the sim card.

I wouldn't suggest you use this to register your Dream Market vendor account, but I doubt you'll end up with targeted advertising based on your other real-world web/app behaviour based just on the ID provided for a single-use burner SIM...