This list is... fine, but unfortunately missing a number of good FOSS alternatives. Still, it's good info for most of these categories.
Having said that, it's eternally frustrating that infographics like these so often don't recommend actual alternatives for YouTube specifically. It's always just "keep using YouTube, but with these apps instead" which, that's "fine", but not exactly degoogling. It's not even really a step towards degoogling, because you're still tied to watching content from Google, so when that frontend stops functioning, you're highly tempted to go back to using Google's YouTube apps.