In any country they would be more likely to be thrown in a government-run prison, even in the US, but you’re right that a lot of countries will still not allow prisoners to engage in independent business ventures. Especially in the US where the government would rather use their prisoners for slave labor.
Basically, what does the more than likely, for profit prison, get out of them allowing this. Nothing, so they won’t.
In any country they would be more likely to be thrown in a government-run prison, even in the US, but you’re right that a lot of countries will still not allow prisoners to engage in independent business ventures. Especially in the US where the government would rather use their prisoners for slave labor.