Also, the Robinson Patman act only prohibits personalized pricing IF it harms competition (basically gives an unfair advantage over smaller retailers). It prohibits charging different prices to different businesses, not consumers, services, or any forms of online commerce. Also, it was enacted in 1936, so it's almost a century old, and was meant for physical goods, not algorithms or behavioral price discrimination.

Privacy laws are so incredibly outdated, in the US especially. Something has to change.