As a GrapheneOS user, I've had to buy pixel watch 2 in order to be able to pay via Google Pay abroad (since I unfortunately happen to reside in an internationally sanctioned country, local cards work only inside the country, some crypto exchanges provide Visa/Mastercard cards, but virtual only, so Google/Apple pay is the only choice). I really wish I haven't had to own this android-certified™ device in the first place. Have had to disable as much GMS system permissions as possible, such as pulse, GPS, physical activity via ADB.

P. S. Since it's not even possible to add a new card if the watch is paired to a device that doesn't pass SafetyNet, I've had to add cards with a stock android device, and then re-pair the watch to GrapheneOS device. This almost seems like a deliberate choice by Google.