In the democratic tradition of opposing monopolies (which goes back to Sir Edward Coke’s treatises), the government cannot favor one industry, corporation, or business over others by granting it immunity from taxes or immunity from lawsuits/the legal process.
The practice of granting such immunity violates, directly, the principles of democratic republic. As defined by Sir Edward Coke in Institutes of the Laws of England (1628-1644):
A monopoly is an institution, or allowance by the King … to any person or persons, bodies politick or corporate, of or for the sole buying, selling, making, working, or using of any thing, whereby any person or persons, bodies politick or corporate, are sought to be restrained of any freedom … or liberty that they had before, or hind[e]red in their lawful trade.
A unique allowance to any industry (such as a ban on soda taxes or immunity from lawsuit for certain medical products) is a monopoly. It is unjust in the most literal sense of the term “justice”: which requires that laws be consistently and equally applicable, without contrived and arbitrary exceptions.