I think about this a lot.
The same thing, at a smaller scale, is true for LeatherMint. Every single move forward as been the result of profits generated from sales paid in bitcoin. No debt access, no outside funding, no grants. All of this is absolute pure Proof-Of-Work.
A company who survive and grow from outside funding is Proof-Of-Stake. That isn't necessarily bad. A lot of good companies emerges from this after a while. But if you're born and grow through Proof-Of-Work, nothing and no one can EVER doubt your worth.