I was even asked to pay several hundred thousand dollars for an interview

Why didn't I think of that? Cheesy

For that price, I'll even give up on this for 2 questions:

Ability not to answer any questions

Seriously though, was that a serious answer or someone just pulling your chain a bit?

DeFi stands for Decentralized Finance. "The new way money is distributed".

Although, I don't think that it should be asked to every person.

Agreed. It sounds like altcoin advertising inside an interview.