Waitstaff are employees, and aren't providing the chairs and plates. A waiter gets his ass in the restaurant and does stuff. That's it. Totally different situation.
Drivers are subcontractors, and if they are looking at striking, that's a signal that their pay isn't sufficient. Ride sharing providers encourage their contractors to perform accept tasks in a way that resembles full-time employment, but the message they recruit with is that "you're making extra money with your car, which is "free"". It's a bad deal because they pay $0.85/mi, and operating the car costs around $0.58/mi (which is a lowball estimate for livery use, and $0.23 of that is depreciation). When you factor in additional wear and tear, brakes, etc, full time drivers probably have another $0.10 of expense.
It's inherently exploitive, as Lyft subcontractors are working for cashflow and operating at a loss.
Where the money comes from is Lyft's problem. They can cut operational overhead, raise prices, reduce R&D science projects, take measures to eliminate unprofitable routes, etc. The usual reply is "robot cars are coming and this goes away"! That's not really right either -- there are no sentient robots driving around looking to be exploited, so they will need to own or lease those assets, which will depreciate at something like $0.50-0.75/mi (your robot cab isn't going to be cheap), and they will need to manage, insure and maintain the assets, which isn't cheap either.
Congrats to the folks who cash out. As amazing as ridesharing is, it's a fucked business.