It breaks in a robust way. Like an escalator. If it breaks, it just becomes that run-out-and-start.
If it costs next to nothing then it's a good feature. It's like the remote for my TV. Sure I can get up and change channels, or I can walk and start the car. but chances are I'm gonna say "nah" and just cold start it. I'm not paying $8 month but I do pay $40/yr for the volvo version (although that has a bit more than just remote start. I use the remote heater start 100x times more than remote start though).
I mean if the heater is remote started then why wouldn't the engine be. It's just the 2nd step of the heating process.