This is a common scam where companies run "employment" ads when in fact they are looking for an "independent contractor". and otherwise.
Taxi cab operations are USUALLY run as "lease" contract operations, but most of them cross the line with work rules, etc that actually make the driver an "employee" under the law.
Worker misclassification is illegal, being a violation of state labor laws, federal labor laws, and IRS code.
Notify the people at where you found the ad that an illegal ad is being placed.
Get the IRS form SS-8 and fill it out completely and submit it. [This is my favorite, and is the most effective].
Write letters to state and federal labor offices.
Legally, they CANNOT run a "job" ad or run any ad in an "employment" section if they are not looking for an "EMPLOYEE".
They need to advertise in the "BUSINESS OPPORTUNITY" or "SELF EMPLOYMENT" section to be in legal compliance.