I think the EU should pile in as well. It's basically an oven-ready independent mobile OS.
The EU hate GrapheneOS. They chased them out to Canada just last year because they didn't want to put in backdoors for law enforcement.
The EU should pile money into /e/OS. It's maintained by an EU company (Murena) and has European hardware options - Fairphone (NL), SHIFTphone (Germany), and Volla (Germany). Yes, I know some of them use US Qualcomm chips, but you have to start somewhere.
Graphene OS spends its social capital on hallucinating attacks from other projects and bullying other projects by sending their followers against them, based on those hallucinated attacks. It also has a completely intransparent project structure based around a supposedly retired mean developer, who then just did not (and still does almost all commits). That's not a project where the EU can invest money in, and the confidence users on HN tend to put into that project is baffling.