Yes, and when they do find you. They will do 2 things.
1. Request you nicely to remove it,
2. If you don't, the barage of lawyers
There is no point in putting courtesy.
Consider it like this You steal a car from a car dealer. You sell it on your car lot saying you got it from the other people as courtesy. It does them no good.
They make advertising revenue from people visiting their website. So its no use to them if out of courtesy you mention their name.
How blogs copy content from other blogs is they only summerize the article. They don't copy it verbatum. Then provide the link to the full article on the bottom. So people eventually go to the original site.