It's still a volunteer effort in the sense that users are not paying customers.
Discussion
What? That's not what volunteer means. Are you pointing out that it's not a commercial project? I don't understand your point.
Paid volunteers are a thing. Especially if you consider the opportunity cost of not working for Google.
From the point of view of a user it doesn't matter if a developer is working from savings, government welfare, or hired by a benevolent rich Bitcoiner. Users are not customers of the developers. There's no fiduciary duty. They don't get to make demands. You would treat them exactly as you would a volunteer in the more narrow sense of an unpaid volunteer.