To see it in action:
Crust.piefed.social (the Piefed development instance)
Not all instances implement it yet, I guess it depends how often they pull from the dev branch
Example of search for 'movies'
The main issue with Lemmyverse is that it doesn't show Piefed communities on the Communities page, making them invisible. This solves that issue.
For unfederated communities, not sure, @rimu@piefed.social should known.