Regarding other existing grants, Vup (vup.app) is powered by S5 v1: Rewrite it in Rust (Large Grant Proposal) and I expect that the developer will be continuing development after they get their foundations rebuilt in Rust (the main app needs a lot of updates). They are also working on integrating with latest efforts like RHP4 (renting proto), and will support the newer efforts from the foundation, when released, like indexd.
Regarding video streaming, IMO that can be done in a lot of ways, and at the most basic is just streaming from HTTP a fileshare which needs nothing external. If your getting into transcoding though, then Theta or Livepeer might make sense. However another grantee has been doing streaming related R&D for movies and music that you may be interested in as well Profile - juleslai - Sia Forum
I am glad to see a new potential developer who cares about Sia’s values regardless.
Kudos.