TILvids seems to have lots of content.
Fediverse
This magazine is dedicated to discussions on the federated social networking ecosystem, which includes decentralized and open-source social media platforms. Whether you are a user, developer, or simply interested in the concept of decentralized social media, this is the place for you. Here you can share your knowledge, ask questions, and engage in discussions on topics such as the benefits and challenges of decentralized social media, new and existing federated platforms, and more. From the latest developments and trends to ethical considerations and the future of federated social media, this category covers a wide range of topics related to the Fediverse.
Blender has their own instance at video.blender.org.
There is an instance with Debian conference videos at peertube.debian.social.
This might be an odd question to ask, is there an Curlie, https://curlie.org/en, equivalent to Sepia, https://search.joinpeertube.org/? There is some value in human curation sometimes, and sometimes you just need a search tool.