Still, you want to limit your liability.
Not following FCC rules seems a stupid and pointless transgression
Perhaps unless the FCC rules themselves are pointless?
The reason why Uber and Lyft are given a hard time is that they're a serious threat to state-maintained taxi-cartels all over the world.
No, they're given a hard time because they ignore regulation like driver background checks or insurance or calibrated tamper proof meters.
"Ignoring regulations" in this context basically boils down to "competing with taxi cartels". That's obviously upsetting to the cartels, and unhappy noises are made about background checks and meters, as if those potential problems could only be solved with a cartel.
We both know that Uber & Lyft drivers give better service overall than taxi drivers overall. That's because Uber and Lyft are not part of a cartel, and have to therefore please their customers lest they lose them.
"Turns out we can't operate like a Taxi". "Turns out we are actually supposed to be treating the drivers as employees". "Turns out we are supposed to be vetting these drivers more extensively".
If uber and lyft asked permission they simply wouldn't exist.