Is your watermelon certified? Does it meet various opaque standards? Are you part of the state-sponsored cartel allowed to sell watermelons? Do you have the required KYC fiat payment system to make sure tax is paid and records are kept?
What most people experience as Capitalism in real life has very little to do with nonstate "ideal" Capitalism.
Especially in the non-US nations of the West.
So when you say to a normie "but Capitalism doesn't XYZ", you're talking about something completely different to what they're talking about.
And what are words for, if not to communicate?