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Decent YouTube client?
(lemmy.ml)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
Matrix space | forum | IRC
Newpipe has groups that you could use to separate subscribed chanels by account. No logging in though, by design.
LibreTube also has this.