Top companies spend big bucks on their logo. After all, it's the visual representation of their character. An easily digestible display of their core values. In other words, a company's logo is its face. And you bet your wallet they want to look appealing.
So it's only natural when up-and-coming designers try to prove their worth by recreating famous logos. "These guys get paid millions of dollars but I can do it better for a fraction of that cost." The ultimate power move.