Found this on GitHub and couldn't stop reading. It's from a Texas A&M and YouTube/Google team and what got me is it's not your typical blind upscaler where you just cross your fingers and hope.
You actually pick a few keyframes, upscale those yourself however you want, and it propagates your choices across the whole video. That level of control is something I haven't really seen before in VSR. Clever idea honestly.
Apache 2 licensed too so worth a look.
Has anyone tried it yet?
https://github.com/taco-group/SparkVSR
SparkVSR: Video Super-Resolution You Can Control with Keyframes | Heykuki News