> When you tip, is the driver individually informed?
No, not directly. Yes, indirectly. You get a ride summary at the end of the day. Backtracking who tipped what takes effort. Even so, sometimes people tip when they open their app back up (or through the email) which can present a lag... I've gotten "x tip from day y" additions to my ride summary days or even weeks later.
Bottom line: If you have 15-20 rides a day you're not going to check unless it was memorable. Over the course of a year and half I checked maybe five times. Once, when I drove the guy who owned the world's second tallest yacht. Another time, when I drove a group of stanford students from north beach back to campus. One of the passengers threw up in the car four times (but I was super prepared with emesis bags), so I saved the guy who ordered the lyft the $150 cleanup fee. He tipped me $20.
Honestly, a perceptive driver will be able to tell if you tip within the first few moments of your entering the car. There are socioeconomic trends. I once picked up a valet at a fancy restaurant in San Diego. We chatted about who tips and who doesn't. Soccer moms in their minivans tip. Tesla and Porche drivers almost never tip. Are you picking up someone working in the service industry? They're almost guaranteed tippers. Is someone a lyft/uber driver? Almost guaranteed to tip too.
> The next time you get the same driver, are they in a position to remember that you were a bad tipper on the last trip?
Yes, but it's unrealistic. Over the course of a year and a half approximately 10,000 distinct people rode in my car. Only about 10-15% of my rides had a tip. Do you think I knew exactly which 10% were tippers?
> Even if the driver isn't made aware of your individual tipping history, surely the company as a whole is tracking this information and building a (negative) profile for you. Do they charge you more on subsequent rides to compensate for your perceived poor history?
They won't charge you more on subsequent rides.