Why might several authors have used "Shakespeare" as a pseudonym?

Name as a pseudonym

In his surviving signatures William Shakespeare did not spell his name as it appears on most Shakespeare title pages. ... This is taken as evidence that he was not the same person who wrote the works, and that the name was used as a pseudonym for the true author.

one of life's odd facts that the most frequently asked question about Shakespeare is whether he wrote the plays that were published under his name. In recent times it has become almost fashionable to find all kinds of other people who, it is alleged, actually wrote the plays. on this odd flowering of conspiracy theories.

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a, a knight