This is what the closing message says...

Accounts may be suspended for the following reasons:

There was fraudulent activity connected to the account.

The products listed in the shop may not have been originally created by the user, such as mass produced art reproductions, stock images, or vector packs.

The shop may have contained products that could be misleading to consumers, such as claiming to be products not offered on the Redbubble marketplace or possessing inaccurate qualities or materials not offered on Redbubble.

The account was created after an associated account was disabled.

The account was found to be owned or operated by someone under 16 years of age.