This would almost certainly raise prices across the board, which would end up hurting poor people.

Price targeting can be (and often is) a useful and mutually beneficial practice. Obviously it can be taken too far as we're seeing here. I think enforcing privacy rights of consumers would be a better legislative goal than uniform pricing.

But price targeting effectively increases information asymmetry. It would be a truly bizarre turn of events when the party on the wrong side of that asymmetry would benefit from making the asymmetry worse.

The price of a loaf of bread will probably just rise, for each individual, until everyone is reduced to different shades of poor, no matter how much they earn.