I was googling for my own answer from couple of years ago and was surprised to first find it from an Indian site called "Query Starter" https://www.questarter.com/

This site seems to mirror all questions from several SE sites, but not in realtime. I wouldn't mind if it was stated clearly that they are providing e.g. an accessibility interface or a proxy for slow local connections to enabling access to these sites via Stack Exchange API.

But it's not. It's just all our content with added Copyright © QueStarter 2019.

Does this site have any contract with SE? Is SE aware of it?

Not sure if this should be handled legally or technically... possibly both.