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Who takes their car to a dealer to have it serviced? Certainly not everyone.

In the UK all cars need a yearly MOT.

https://www.gov.uk/getting-an-mot/the-mot-test

I guess most of Europe has something similar.

But MOT does not require going to a dealer, just to a garage. For sure dealers do this too but it's not a requirement MOT be done by the dealer of the brand.

That would cause an even greater scandal than what they are in right now.

Only let them claim the hypothetical $1000 payout if they come in to flash the ECU.