I looked up Magic Earth because of your comment and was disappointed that you require either a Google Play account or an Apple account as the app has a €0.99 annual subscription. On the bright side, they have an FAQ that states they are working on an alternative. So, hopefully soon we will see that implemented.

I know that the GrapheneOS team have mumbled about the possibility of working on their own device. Although, this would probably be a long way off if it ever did come to fruition.