Several reasons.

• Easy to defame and destroy the reputation of the creator.

• Removes the 'mystery' and 'intrigue' of what genius created it.

• Can be abused by Paytriot edgelords.

• Allows censorship algorithms easy access to defining characteristics of targeted 'enemies' for swift removal.

• Defeats the purpose of being an Anon. We are a team, not an individual.

• Allows easy routes for narrative control, and decimation of the message behind the meme through any of the above.

Nobody knows who first created Wojack, but everybody knows Wojack.

Likewise, everyone knows who created Pepe, but nobody knows who stole him from the cuck that created him.