Hyundai and Kia added official GrapheneOS support to their apps months before Volkswagen banned GrapheneOS: discuss.grapheneos.org/d/316… Pressure from Volkswagen customers on them can achieve the same thing. There's no legitimate reason to ban GrapheneOS so they'll undo it with pressure. Leave a 1 star review for Volkswagen's apps on the Play Store asking them to stop banning GrapheneOS. Explain it's a far more secure operating system and fully possible for them to verify the hardware, OS and their app on it if they insist on doing it. It's far more secure than anything they allow. Google has misled companies about what the Play Integrity API provides. It doesn't genuinely enforce having a secure device or legitimate app, it only pretends to. It leaves huge security holes open. It enforces Google's business interests and bans having a reasonably secure device with GrapheneOS. Most companies are unlikely to stop using the Play Integrity API but most are willing to start permitting GrapheneOS via hardware attestation with enough pressure. In addition to every user of their app on GrapheneOS leaving a 1 star review on the Play Store, multiple other steps can be taken too. Every GrapheneOS user with one of their cars using the app should file a customer support request. Keep answering them and countering the template responses. Escalate the request higher up. Tell them you want money back for the vehicle due to reduced functionality after the fact and insist on it. They can trivially stop enforcing the anti-security and anti-competitive Play Integrity API or easily add hardware-based verification of GrapheneOS. Link to grapheneos.org/articles/atte… in the customer support request, but don't add any links to Play Store reviews to avoid filtering. A bunch of apps have added explicit support for GrapheneOS due to pressure from our users. Our userbase is rapidly growing and we'll gain the ability to apply massive pressure to companies doing this. We plan to ship a feature for our Info app for people to opt-in to getting asked for their help. GrapheneOS is production quality OS from a non-profit paying around 15 people to work on it. It's far more secure than anything supported by the Play Integrity API. We have an official partnership with Motorola and we'll have more. Just counter template responses and insist on compensation or a fix.