The article documents recruiting Lyft drivers by riding with them, which is neither unethical nor illegal. It doesn't document cancelling rides, which would definitely be unethical, and should be illegal.
Uber ought to be liable to a lawsuit, at least in general for violating Lyft's terms of service with fake accounts on a mass scale.
Along the same lines as the AirBnB spamming controversy, when it was reveled they violated Craigslist's ToS on a large scale to grow their business in the early days.