This is so cool! I had a similar (more related to transcript fulltext search though) idea but decided to work on something else after realizing that Youtube has no video sitemap so I'd have to scrape it in a pretty ad-hoc annoying way. I imagine storing all the videos must be pretty expensive too. If I was a youtuber I imagine I would use this if I wanted to use a certain Ellen clip or something like that which is pretty convenient.

Interesting concept, I can see it working as a subscription where I add alerts for certain channels to see when a word or a phrase mentioned.

I tried ChatGPT and had 17 results, I suppose it’s related to how many channels have you added to your transcript list?

The other interesting part was trying a non English word and still had a result.

Good luck!