Tech companies and their executives have, broadly, moved to align themselves with investors and adopted a posture of, often, disdain or outright hostility towards their users and employees. If tech companies don't value you, why provide value to them? If they back political positions hostile to your interests, why not return that hostility?
If his data only exists in one place, it’s at high risk of being lost anyway. The cloud is not a backup. Plenty of stories of people losing data in the cloud because of bugs/mistakes, companies closing down, hardware failure, etc.