Generally, because most people don't consider, or care about how their online presence is utilized, monitored, monetized, or otherwise subject to scrutiny from third-parties. Or about privacy, and the implications that arise from measure such as these.
And because most who serve in authoritative positions are technophobes, legislation such as this is passed and enacted without objection, from the constituency who purportedly are the ones that should be served.
Low effort constituency = low quality government. Applies to everywhere and everyone. Rinse and repeat.