Have algorithms become the new decision-makers?

In any case, they are the ones who have primacy of lʹ accès to our personal data, who analyze it, put it through the mill and classify us, label us, confine us to this or that category. Market research, targeted advertising, profiling, solvency, professional recruitment - algorithms are everywhere. Should we welcome them or fear them? Is the power of appraisal shifting from man to machine?