It’s not useless, It’s so they can analyze all the photos you ever take and see who you associate with and what products you own so they can determine your needs and likely income so they can put more ads in front of you that are likely to work

Just like how they already scan all your private documents that they just decided were theirs to upload one day in order to see what you write about and how much you budget and h̶̘͖͐̂ȏ̵̖̀w̴̰̲̅ ̶̩͕͠ẙ̵̝͗o̶͙̓̍u̶͈͈͆̃ ̷̨̜̽f̸̫͌ͅu̸͎͒̓c̴̳̗͌͛k̶̰̏i̸͖̥̽ņ̶͇͋͝g̵̘̓ ̷͈̏t̶͓̋h̷̬͗͌͜ī̶̼͙̇ǹ̷̗̾ḱ̷͚̝̾ ̵̙̎̋a̵͇͐ǹ̵̩̼ḋ̸̩̗̐ ̵͚̘̈́o̶̥͑̍p̴̖̫̏̂ē̴̟̱̈r̸̖̜͂å̷̲̣t̶̥̍̓è̵͉̖