> has anyone had success with an Article 21 "right to object" request
Facebook breaches the GDPR when it comes to data subject access requests and appears to get away with it: https://ruben.verborgh.org/facebook/ so Article 21 is likely to have the same outcome. Facebook (and other companies) also breach the GDPR with their non-compliant consent prompts (where you can't actually decline) when visiting their websites and also get away with it.
Facebook breaches the GDPR when it comes to data subject access requests and appears to get away with it: https://ruben.verborgh.org/facebook/ so Article 21 is likely to have the same outcome. Facebook (and other companies) also breach the GDPR with their non-compliant consent prompts (where you can't actually decline) when visiting their websites and also get away with it.