I don't understand why the map updates need to be paid.
The cars all come with a navigation system, or at least vast majority of cars. They are selling cars constantly so the stream of revenue is constant. Why do they make cars feel outdate when you realize a roundabout that was built 3 years ago is still not visible in your navigation?
It feels like a petty cash grab that could easily be covered by miniscule increase in price of the car or by just reducing profit slightly.
Map updates under mib2 with VW and Skoda are free for life which means untill they stop releasing them. Seat has always tried to monetise that via Mapcare. Mapcare was never sold in the UK but for the SD card based mib2 use the workaround which was perfected by a member of the board in 2017 now spread worldwide. Mib2 high you get the navigation FeCs altered to life long, service offered by East Yorkshire Retrofit or you can do it yourself using Mib Tool, you might have to change the firmware to do that thou. Sits in the green menu and allows you to change FeCs yourself.
I agree map updates should be free or very low cost. Consumers Association many years back listed off the bad boys that charged for map upgrades. Seat didn't alter it's ways. Mib3 it's got worse than that with VAG now charging in West Europe for map updates across all the brands via connected services. East Europe (Russia) free via the import menu that is locked in the West. I guess a way round that will be found.
As far as keeping the map up-to-date, Here Maps which is used on mib3 and mib2 high you can register for a Here Map Creator account and add missing features. You have to keep at it to insure the edit is taken then that will be passed from the development database into the production database. Mib2 standard uses TomTom, again you can register for an account and mark up incorrect features. Here you don't draw it up, you leave it for TomTom team. Possibly why TomTom maps are sketchy in places. Google Maps has a similar feature and Waze. Validation is important in all of this. Google Maps has some terrible cartography on it constructed from aerial images rather than OS planning maps.
In the UK all validation should be done via the OS planning maps or site plans against against the aerial image. Google Maps don't, Waze ditto. When a housing estate is built the developers use developers roads where the building material is stored. They are not public roads. Often Google / Waze show these and not the finished estate (half an estate plus builders roads etc). They should never be digitised since they aren't public roads.
Google also has farm tracks digitised as public roads which leads to your car taking you up private farm tracks. Waze has roads on housing estates drawn up which arent even built. Situation becomes even more appalling when digital map providers analyse each other maps and mark up areas as mistakes. These fantasy roads then get digitised as fact across map providers. Only one that is really validated is the OS planning maps which is the gold standard since its a proper survey map carried out after the development.
Digital map providers also need to add road speeds. They obtain those from local authorities and regional government on paper / pdf. The junction lane positioning and one way systems via car. They also use GPS mobile phone probes as a way of tracking routes. This is where builders roads pass validation since validation isn't carried out correctly. The fantasy roads.