I don't about the newer (uConnect 5) trucks but the remote start on my fob is a "hard-wired" function. It it part of the truck and not a subscription service.
For now the subscription stuff are things that travel to/from the truck like satellite radio, GPS tracking, and anything you would do from your phone (app). Things that you do from the fob are included with the truck and option package(s) you paid for (door locks, remote start, tailgate, air suspension).
There will be a time in the not-to-distant future where that will not be the case. You will pay for the capability (hardware/software) when you buy the truck but will have to subscribe to activate and use those features. I think it will start logically with advanced features like HUD, vented seats, self-driving, etc., then eventually reach it's way down to most non-federally mandated safety features like adaptive cruise control, dual zone climate controls, display themes, and the like.
That's complete speculation and opinion on my part but subscription services are coming. The auto makers have seen the billions of dollars out there for the taking and they're going to get it.
Some tested the waters with overwhelming negative feedback as they are trying to get the consumer to embrace it. At some point, though, they'll make the collective decision to implement and we'll have to accept it.