scammed by fake yearn.finance

Hi,

a friend of mine was scammed by a fake yearn.finance website and lost some Eth.

I don't have the details so far, but in general how are chances to get the Eth back?

He googled a bit and found this website https://payback-ltd.com/

They want $ 3000,-- in advance, and if they can recover the stolen eth they want 10%.

Is this site/company trustworhty? Does anyone have experience with it?

Thanks for your help!