Privacy activists, such as Austrian Max Schrems, have expressed strong concerns about this model.
Wanaharakati wa masuala ya sera ya faragha ya mtandaoni kama vile  Raia wa Austria, Max Schrems,  ameonesha hisia zake kuhusu utaratibu huu wa kampuni za intaneti na vitumizi vya teknolojia wa kujipatia kipato kupitia taarifa za wateja wao.