Ebay Bans The Use Of The Word "Degen" On Auctions
Thanks to Ebay seller Liypn we learn that Ebay as prohibited
the use of the word "Degen" on their auction site. This is result of a
complaint filed by Degen GmbH Communication with Ebay as
unauthorized use of intellectual property rights, copyright, trademark,
etc.

Does anyone know why this happened?

Probably because they didn't want their company reputation to be ruined.