Many assume it was because of the lawsuit with PandaCo, but I know the truth. In 1999, the WWF was approached by a man only known as Amphib. Amphib disliked Vince and had him kidnapped and taken to a palace built under the sea. While he was in captivity, Vince was questioned for hours every day about a secret formula he had been developing.
The formula would have the possibilty to generate infinite resources of food in fractions of seconds, but he knew that in the wrong hands it could also be used to wipe out the entirety of the worlds food and horticulture.
One night after his regular interrogation, he heard a crackling sound coming from the air filtration system in the wall. Looking out of he was surprised to see a fleet of dolphins. But these were no ordinary dolphins you see, because upon these dolphins were an assortment of wrestlers ready to fight for Vince's freedom.
After smashing through the wall and retrieving Vince, the fleet of dolphins had been attacked by olympic wrestlers riding sharks. The sharks were stronger no doubt, but lacked the coordination that shined in the dolphins.
Upon seeing Amphib, Vince ordered one of the dolphins to attack. Not only did it attack, but it attacked him in an area most important. It bit off his penis and returned it to Vince.
From the excess blood releasing from his now vagina, the sharks had all gone rogue and began attacking Amphib.
Making their way back to the surface, they thanked their dolphin army and made their way back HQ. Inside his Office, Vince sighs as he places the penis on the wall with two other penises above it, shaping out the letter E.
So now you know why they changed the F to an E.