I assume it references the song Gdzie jest biały węgorz ? by Cypis

Nothing factual

Make sure the OP provides you with a binary first

Whatever you want, man, that's the trick

How about the good old Danny Trejo?

That's exactly right. They won't.

If only it were a piped link

Aren't you?

I understand. But if you cannot see the slope of others, how can you be sure?

Yes. It makes sense to limit everything except thing required to interact with such sites when accessing them, but, as history tells us, not everything served as higher purpose will remain noble and harmless. It definitely has potential to be used against users in the future. Will it? It is very much in line with what Web Integrity API proposed as a "solution".

EDIT: added the last sentence.