I agree, though sometimes it's not actually bribery. If a company, for example, offers inmate telecom services to a prison, and offers to do it at "no cost at all to the state" or "revenue share", it sounds attractive. Of course, that means "exorbitant costs to the prisoner's families".
Revenue share isn’t bribery because the revenue isn’t shared with the judge. It’s a cost structure to make the municipality or whatever avoid having to outlay money to build something.
Similar to some joint public/private toll roads, red light cameras, etc.
If you can de-incentivize a behavior, you can prevent it. But just 'banning bribery' has already been done. Banning any and all perverse incentives from the justice system is actually very difficult to the point of near-impossibility. Hence the current system.
It doesn't stop there. For profit prisons spend millions of dollars lobbying: https://www.opensecrets.org/industries./indus.php?ind=G7000
If you want to see intent, follow the money.