@gnupropagandaWhat about Riot.im?
As far as I know, Riot.im in the browser is free. It is when it is used via the electron application where ethical problems arise.
There is other clients, but I dont know how good they are compared to riot.im
A instance dedicated - but not limited - to people with an interest in the GNU+Linux ecosystem and/or general tech. Sysadmins to enthusiasts, creators to movielovers - welcome