Watched Louis Rossman today, and he's part of the team behind a new app for watching online video content - not just youtube, but nebula, peertube, twitch and more.
adblock already integrated, works amazingly with a quick test on my end - it's an app in the Lemmy spirit
(it's got a paid model similar to winrar, you don't have to pay - but they do want you to - opensource and all)
"open source" is a self explanatory phrase. The source code is open, therefore it's open source.