Why not let the market decide? If drivers are so unhappy why not just seek some alternative form of work? Uber/Lyft do not force anyone to hop online.
Because collections of people organized into corporations have greater bargaining power than individuals in negotiations. Traditionally the answer to that is unions or professional group who can bargain on behalf of all their members, but it's hard to unionize fields with low barriers to entry (and harder when the workers are living paycheck to paycheck and thus can't strike easily), and impossible to unionize indepe…
What laws, don't you have freedom of association in USA? Just create a group, what is stopping you?
Speaking as an ignorant European.