While title is click bite, they do say right at the beginning:
*Right now, it is pulling through only because of Microsoft's $10 billion funding *
Pretty hard to miss, and than they go to explain their point, which might be wrong, but still stands. 700k i only one model, there are others and making new ones and running the company. It is easy over 1B a year without making profit. Still not significant since people will pour money into it even after those 10B.
I think he did suggest droid-ify with fdroid repo: https://github.com/Droid-ify/client
Looks good, I will try it out. You have it in F-droid :)