What do Uber and Lyft say about soliciting services as a driver

Someone posted about selling weed as an Uber driver. What about other stuff? I assume they have some strict policies about this but... do they? Such as:

• Promoting local businesses by handing out business cards (like, restaurants would pay you to do this)
• Selling late night snacks to drunks. You could have a little hot dog oven in your car powered by an inverter!
• Selling magazine subscriptions
• Prostitutes selling... themselves. Think about it. Hey, if they don't get a customer, at least they get paid by Uber.

What do the ride gurus say on this.