Installable via F-Droid, always a good sign.
f-droid website says "This app promotes or depends entirely on a non-free network service" -- whats that all about?
See https://www.gnu.org/philosophy/who-does-that-server-really-s...
> Many free software supporters assume that the problem of SaaSS will be solved by developing free software for servers. For the server operator's sake, the programs on the server had better be free; if they are proprietary, their developers/owners have power over the server. That's unfair to the server operator, and doesn't help the server's users at all. But if the programs on the server are free, that doesn't protect the server's users from the effects of SaaSS. These programs liberate the server operator, but not the server's users.