Jim Crows didn't force businesses to not serve or hire black patrons, it allowed them the option of seperate service which they voluntarily did
Here's a black American describing what ordering from a white restaurant was like
Brief overview of life as a black American working for white businesses and families
Jim Crow was based on the "separate, but equal" clause which said, on paper, black Americans still had to be given service as long as the quality was on the same level as white Americans. It's basically the opposite of an outright ban on non serving non whites, it technically is supposed to enforce serving black Americans
Can you imagine some dumbfuck chud in 2075 being like
Cake decorators wanted to serve gay customers but they weren't allowed to. They didn't care about rainbow, all they cared about was green