In 2000, the World Wide Fund for Nature (also trademarked WWF), an environmental organization, sued World Wrestling Federation Entertainment Inc. The Law Lords agreed that the promotion company had violated a 1994 agreement as Titan Sports which had limited the permissible use of the WWF trademark in Europe, particularly in merchandising. The World Wide Fund and World Wrestling Federation used the initials since March 1979.
The last televised event to market the WWF logo was UK based pay-per-view Insurrextion 2002. On May 5, 2002, the company launched its "Get The F Out" marketing campaign and changed all references on its website from "WWF" to "WWE", while switching the URL from WWF.com to WWE.com.
The next day, a press release announced the official name change from World Wrestling Federation Entertainment, Inc. to World Wrestling Entertainment, Inc., or WWE, and the change was publicized later that day during a telecast of Monday Night Raw, which was broadcast from the Hartford Civic Center in Hartford, Connecticut.
Following the case, the use of the "Attitude" logo became prohibited on all World Wrestling Federation properties. Additionally, past references to the WWF trademark and initials in 'specified circumstances' became censored. Despite litigation, WWE is still permitted use of the original WWF logo, which was used from 1979 through 1994, as well as the "New WWF Generation" logo, which was used from 1994 through 1998.
Furthermore, the company may still make use of the full "World Wrestling Federation" and "World Wrestling Federation Entertainment" names without consequence. In 2003, WWE won a limited decision to continue marketing the WWF Video Library censoring out all WWF references, other than the permitted logos.
I guess someone was scared that someone else might confuse Hulk Hogan with a large ape. Then again...