I'm sure celebrities can easily package their offerings as an LLC or the like. It's just that then you can't spend it however you like.
You want to spend your money however you like? That's income. "They can't play tax tricks to avoid income tax" is the system working, not a bug
This stuff happens a lot. Celebrities don't make money through a business front nor do they get to class it as capital gains. It's all "income", so the incentive to turn it into a cheaper tax category or hide it offshore is huge.
See also the Glasgow Rangers collapse due to tax fraud.