they made a deal with Motorola, from next year we should have an alternative.

in any case, google started to cause issues with pixel 10, so it's not as easy to port it

GrapheneOS has full support for 10th generation Pixels. It was much harder to add initial support for them than past generation Pixels but it isn't harder to maintain now that they're supported.

There should be multiple 2027 Motorola flagships meeting all the requirements for GrapheneOS. They'll be providing official support for it and they're already working on porting GrapheneOS to their devices.