Yes, it's true that by essentially hacking Uber and Lyft's systems, you could create an app that siphons away business from them.

But what would happen if such a technique were to become legal and ubiquitous?

Suddenly, no one wants to invest in a company that requires significant capital, because they know that as soon as the company becomes successful enough to become a target, there will be other companies that will swoop in and attempt to exploit its technology so they themselves don't need to invest significant capital.

The damage to the market would be severe.

That said, as a fan of distributism https://en.wikipedia.org/wiki/Distributism I am also a huge fan of cooperatives, and I think worker-owned co-ops can be successful in the ride-sharing space without needing to resort to such tactics.