But users also benefit from it. You can search for the contents of the images in your private gallery.
Can google guarantee this data is not used to fuel their ad or other businesses in anyway ?
Can they guarantee US Law Enforcement Agencies(LEA) will not have access without due process and informing you ?
Can they guarantee LEAs from other countries will not given access to this data ?
If you send it to Google it is unequivocally not private.
https://www.washingtonpost.com/technology/2019/12/19/federal...
By providing ML training data, you're indirectly supporting the consolidation of power in the hands of the few who have the ability to surveil everyone and the physical might to enforce their will.