no they are not ok, people who steal samples and remix are often hated by the fans or musician. The article is not reliable compare to a lawyer who will say that it isn't a good idea to steal someone's music. A guy learn this the hard way:
Yes those are the rules, if you dont credit people you can get sued. This is because people will steal art and people will think they make it while the artist gets nothing. Also Nintendo doesn't remove copycats because they hate creativity, they do it because the law requires them to protect the I.P, just like music copyright requires you to protect your music or lose everything.You have a nice idea i get it but there is a reason why people made laws to protect their art.