Cozy is opensource, as the android version of it.
Why it is not advertised on F-droid.org distribution platform too?
I mean it is only available on Google play store, no binary file (.apk) is available,
no other store is supported (android pit, amazon apps, samsung apps).
So by default all kindle device is excluded (despite it is based android),
and many chinese brand is excluded too, which does not come with Google play preinstalled.
Also Google play from time to time does not work.
For me, I recently get RPC:S-7:AEC-0 error, whenever I try to install any application.
(I tried everything from google search results except factory reset the whole phone)
In my opinion, it should be prominently available as downloadable .apk file on the website, near the Google play icon (where is it?!), and near the F-droid icon:)
ps: Owncloud client is available on F-droid too (not only on Google play)