I think its because
1) LEGO came before Mega Blocks.
2) We're on a LEGO fansite.
3) LEGO sets the standard for quality whereas Megabloks lacks it terribly.
Lets be honest here. The LEGO cow and the Brickforge cow look quite different. So by producing beards and swords brickforge is copying LEGO if we're thinking along the same mindset. Brickforge probably wouldn't exist if LEGO didn't.
I really don't see how the point stands.