What other OS could you want, especially on ARM? Most alternatives to Linux are a mistake for web hosting at this point in history. As much as I like some of the ideas and features of some of the alternatives, when taken as a whole, Linux is simply the right tool for the job most of the time.
In short, while its cool if they offer other OS options, my confidence certainly is not shaken by them choosing to roll out first with just Linux support. It seems like the only sensible thing, to me, given how good Linux ARM support is.
> What other OS could you want, especially on ARM?
OpenBSD. Or any of the BSDs, but OpenBSD would be ideal.
That said, my confidence isn't exactly shaken either by the current lack of BSD availability (FreeBSD is supposedly "coming soon"). I'm getting by moderately well on Linux right now for my own "cloud" needs. It would just be nice to have my preference in operating systme (and ecosystem; I've taken a liking to OpenBSD's subprojects like relayd/httpd, OpenSMTPd, etc., and it's much easier to use these things on OpenBSD - or probably even on FreeBSD - than it is on GNU/Linux).
In short, while its cool if they offer other OS options, my confidence certainly is not shaken by them choosing to roll out first with just Linux support. It seems like the only sensible thing, to me, given how good Linux ARM support is.