A couple of issues with the search:
- PeerTube content still in very early days, so people will usually not find videos for what they are searching for.
- Moderation isn't always the best on the official search page, it's using blocklists rather than allowlists so sometimes nasty stuff gets through.
That was part of the reason I set up https://fedi.video, so that there would be a searchable site which uses allowlists to keep it safer.