Freeze their ability to do anything period. Physically lock the incorporation documents in a prison cell. They won't need to do "basic life support", the documents will be provided with trays of food, water, and adequate opportunities for exercise by the prison facility. If they need more than that, they can petition their former customers to send money to their prison commissary account for the purchase of snacks, toiletries and such.
A fictitious person's executives and directors are typically real. Or, if fictitious as well, go down the rabbit hole of said contractors until you finally find the real ones.
In the country I'm from, each exec gets a partial sentence in accordance with their contribution to the criminal act. And no, the total amount on years in prison needn't match the total, there's a minimum and also percentages always exceed 100%.
Limited liability doesn't and shouldn't protect criminals from imprisonment.
Careful. The real humans at the bottom of that rabbit hole are the individual shareholders. That is the real root of this problem -- the people that ultimately profit from this behavior (a group that, ironically, almost certainly includes the judge in this case, and most of the people in this thread) have no responsibility whatsoever.
Because they're not responsible? We (shareholders) pay executives to manage the companies. This means doing what is best for the company, not committing crimes.
Is your comment asserting that there are no people poor enough to steal food? Or are you claiming that poor people do not get arrested and are in fact treated with kindness and compassion by the various police agencies?