I think Purism would be satisfied with much less initial adoption on the overall market than somebody like Mozilla/Canonical. In short, they'd probably consider it a success much sooner. Also, both FirefoxOS and Ubuntu Touch were essentially adopting the same philosophy as Android in terms of having a closed-hardware approach and a software stack that while open in principle, was largely restricted on-device to run just the apps available in the respective app-stores, made for the platform specifically, which weren't that many.

Purism is making it so that practically any Linux app can be installed out of the box and with a small amount of work, any GTK3/4 app can be made touch friendly as well. I think this could provide them the app ecosystem head start they'd need.

> Not enough people value openness to make the trade off versus iOS and Android.

I think you're, sadly, right. However if PurismOS becomes a solid choice in its own right and then you have the privacy advantage on top, it might sell.

> Does iOS not provide the privacy you need?

Kind of, that's what I use now, however I have to trust Apple on keeping its word, which may be difficult considering they're moving more and more into "services" == rent seeking. Also, I have serious problems with the war on general purpose computing Apple is involved in and the closed nature of their software, where they have the ultimate say in what I can run on a piece of hardware I paid thousand pounds for to own, not rent.