I thought the same thing. Even in a non-regulated industry, the moment you are paid, you're now consulting which can get tricky contract-wise.
In a regulated industry you can argue it's not actually work, as your labor does not produce anything of value.
I think if we follow that slippery slope, employers might as well not pay salaries if they felt you weren't terribly productive during a given pay period.
"you can just ignore it the same way most people ignore their noncompete clauses"
Again, I'd hate to find out that an employer has this attitude toward honoring contracts as you suggest workers do.