From France :
The market share of the Google Pixel has increased since the Pixel 6 because Google started advertising it massively, but it's far from matching the market share of Samsung and the iPhone, users who want economical smartphones and don't care about the rest often turn to Xiaomi, Fairphone has won over users who care about reparability to reduce waste, which is laudable, but users are also fooled by Fairphone's misleading marketing about security and confidentiality.
Some people around me know about GrapheneOS because I've introduced the project to them and shown them the features. Like many products without massive publicity, many have probably never heard of it, so it's a bit of the same answer whatever the country.