This is like complaining that the industrial steel mill doesn't hire artisan blacksmiths. You can still be an artisan blacksmith these days, but more likely at a Renaissance Faire than anywhere else. But I don't blame the industrial steel mill for their hiring policy.
aka, you are not economically valued, and in order to be artisanal, you have to sacrifice monetary gains to achieve it.
> if it is your startup, you can write code however you want.
yes that is true, but a startup is much more than just code. it's a business - with all of the extra work that entails.