That's a right to repair argument, which is a different issue.
There will likely be consumer protection laws and maybe even an "Open Car" project in the same way there's open hardware today.
Are you implying a covetous car manufacturer won't be as protective with their gasoline vehicle line?
But it is so much easier. How car will tell that mechanical part has been changed? It can't.
They're both naturally rather simple affairs: In their most primitive forms, a fuel tank is just a container that holds fuel, and a battery is just a collection of cells.
But nothing at all prevents either thing from being rather more complex than that with the inclusion of necessary electronics that are DRM-locked.
ICE vehicles have hundreds of CAN bus or SPE -networked devices that feed into an MCU that can refuse to work if they're not first-party devices.
This isn't something novel to EV, at all.
It's no easier, or harder: There are components in both systems that rely on network communication which could easily be vendor-locked by a central computer.