I'm building an Open Source Loom alternative. Loom was bought by Atlassian in October last year for almost $1 billion. ScreenLink.io is a privacy focused alternative to this
The main focus on the product has been working on a cross platform application that can record and upload screen recordings, then on the backend it has been everything else to handle this
The source code is available here https://github.com/mangledbottles/screenlink