Well hold on there. NES reproductions of the Mother 1 English prototype aren't "bootlegs". the term "bootleg" carry a negative connotation, and the term itself means a product that is a direct copy of inferior quality sold to steal sales of the original product away by fooling the buyer.

A more accurate term would be a legal reproduction. The prototype Mother 1 translated into English that is the basis of EarthBound Zero has no legal standing as copyrights for it were never put into place and the game cannot be legally purchased in any fashion.

Therefore, its abandonware and free public use until such time as
A. The game is released on some download service such as Wii Virtual Console (extremely unlikely)
B. Copyright steps are taken to actually cover it.

EarthBound Zero will probably be forever ignored by Nintendo of America as the game is too similar to Earth Bound/Mother 2 and they won't even release THAT game.