While the Big-4 billed itself as an amateur circuit, it became known as a notorious example of a "shamateur" league, as amateur teams secretly employed professional players in an attempt to gain an upper hand on their competition. When the Big Four announced their intention to compete in the Allan Cup playdowns, the Pacific Coast Hockey Association sent a letter of protest to the Canadian Amateur Hockey Association demanding that the league be declared professional, thus ineligible to compete for the Allan Cup. The Big Four ultimately chose to withdraw from the AAHA, and operated as an independent league in 1920–21.