My solutions are:
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PocketTube for everything
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For my favs, I add their feeds to Reeder
For doing the last:
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Get the ID of the channel using this tool: https://commentpicker.com/youtube-channel-id.php
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Add the ID at the end of the following URL https://www.youtube.com/feeds/videos.xml?channel_id=
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And add the URL to Reeder (or whatever you use!)