When you see this on your computer, it's already obvious or at least sus that this is a scam website.
I think no one in the right mind would be going to put their wallet private key just for a sketchy giveaway like this, I mean you can't risk it especially when you have a high amount of investment in your wallet.
Experienced people like you don't fall into these traps, these traps are only made for newbies. There are many crypto users who face these scams because they do not know the proper use of private key. When the market is on an up trend, a lot of new crypto users come to the crypto world. And taking advantage of their inexperience, scammers want to scam them.
So just because you haven't been the victim of such a scam doesn't mean that no one else has. We are trying to warn everyone.