I commented elsewhere but GrapheneOS on Pixels actively siphon resources from Google and is arguably a good protest against google.

They subsidize Pixel hardware (to incentivize users to adopt their spyware OS), you (buying used obviously) take their subsidized hardware and do not repay them by using their spyware, replacing it with Graphene. Only google loses. Their hardware is technically very good otherwise (in fact no other hardware fits the strict graphene security requirements).