Separate from tax and employment regulation, ‘contractor’ is also plain language meaning “someone under contract”. If these people weren’t paid what they were promised, they could sue for breach-of-contract.
There’s no trickery here: that’s the ordinary legal meaning, and it is those who insist on only the far narrower regulatory/tax ‘contractor’ category who are playing semantic tricks.
It doesn't matter how many people "explain" falsehoods, like the idea that minors can't enter contracts (even with parental permissiion), or that a person being paid by a company under the terms of a contract is not a 'contractor'. They're wrong despite their multitudes.
Compare this account from a reporter at VentureBeat – who also happens to be a member of the California State Bar – who makes similar points as I have, about how compensated panelists are “arguably limited purpose ‘contractors’ providing data solely for the developer’s research purposes “:
https://venturebeat.com/2019/01/31/the-odd-reason-apple-kill...