While you may be right in terms of Facebook's data retention practices, the argument here isn't solely about data, but rather how deceitful, dishonest, and greedy this company is. There are far better reasons for people to ditch Facebook, including the fact the platform has been siphoning billions of dollars annually from our economy while never giving anything back to its contributors, all the while robbing publishers and journalists by forcing them to pay to reach their own followers.
Facebook touts itself as the platform that brings people together, but the facts prove otherwise. Facebook puts up brick walls for anyone with a creative interest, forcing them to pay to reach even their own family members. My mother could die tomorrow and my friends and family on Facebook would never know it, as Facebook would say "Boost this post to reach more of the people you care about!" Facebook is truly the butt stain of the social web, and people should stop supporting their unending greed.
Not to mention the platform openly promotes fake news on a massive scale, and its always done in the name of profits. Its the social platform of brainwash, manipulation, and unending deceit, and Facebook will always take advantage of it to shove more ads down people's throats.
Not disagreeing here.