My guess/experience.
several spam attackes in the last few years led to a lot of defederation of poorly moderated instances.
opt in federation model combined with lazy and/or overworked sysops
desire to curate the recent videos feed by excluding possibly problematic federation partners.
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Have you tried using Podcasting apps that support video? PeerTube added podcasting 2.0 RSS feeds a few versions back. The subscription process is pretty easy.