Then what's the problem if it's not actually that good for people who leave few, contradictory elements (maybe I would've been easier profiled if I was labelled

Then what's the problem if it's not actually that good for people who leave few, contradictory elements (maybe I would've been easier profiled if I was labelled female for an example). They try to sell me stuff which I won't be interested in, seems fine to me. As for the last part, could you be more precise ? What exactly could happen that would be bad to you ?