I see where you're coming from but being able to leverage open-source software written in (at least) Qt as well as existing and upcoming Linux security features should alleviate some of those concerns. An Apple app store approach surely isn't the only way to distribute apps and "create a community".

One way or the other, open-source software should run on mobile to remain relevant in the future, and I think we should be supportive to those projects and people who try to build some momentum, often with minimal resources.