This sounds like you've never worked in the industry or have any insight into this topic. Large companies like Uber absolutely do listen to customer feedback. And if you want it to hit their bottom line you can protest the use of their app until they change, make it a hash tag on social media and drive change by voting with your feet. You don't need to whip out the lawyers. Lord above, not everything needs to be solved with litigation.

A program to allow customers to tailor advertisements

We're not talking about tailoring advertising. OP stated these are recommendations based on the what he is buying at the time. These are offers. Have you never seen a two for one aisle at your local supermarket? Or special offers on alcohol? It's not a random advert popping up asking them to buy stuff whilst booking a cab. At the simplest level we're talking about a setting that says, don't upsell or market me alcohol (because I may be recovering) or meat (because I may be vegan). That would actually be a selling point for their app and something they could put a positive spin on.

I genuinely think you don't understand the problem space here by what your saying or the solutions you're offering.