I was trying to install Element (successor to Riot.im Matrix client), but it’s not shown in Store (Aptoide one from Jolla Harbor), unless you search by “related” to Riot and then it’s shown there with a warning of mismatching signatures.
Although ver 1.10 was realeased 5 days ago, the current version at F-Doid is still 1.09.
As a main thing the F-Droid version does not have push notifications and thus updates status constantly from your Matrix server, so it takes higher toll from battery. And to avoid viewing “Listening for events” messages you have to manually disable it from Android settings.