Seems https://stract.com ils no longer operational, and the developper is no working on the project any longer...
That's a pity 😥 , I liked the ideas behind this search engine, although the index was never big enough to give really relevant results.
#marginaliasearch is an alternative, it seems.
I'm not sure what it takes to run a web crawler... Or how big the index becomes..
#yacy has a decentralized approach, not sure it works