Assume the communication with the app it through Internet. The car must have a 4G chip (too early to see 5G in cars, I think?). So no matter what you pay, it won’t work when 4G is retired. With marketing pushing to get new standards always faster, 4G may not last another 20years.
Anyway, bear in mind that once you subscribe, they will most likely collect detailed data about how you use the features and sell that as well…
Alternative answer: "We understand your issue and will fix it as time and priorities allow. Please note that customers paying for support always get higher priority. Given MS contributions to the project, this ticket was ranked 42nd in our priority list.
Have a pleasant day! FFMPEG support team"