Veltharis ap Rylix
Legend
If I had to guess, the reason is probably that "shibboleth" is a Hebrew word that was used as a password in the Tanakh/Old Testament and has become a byword for ways of secretly signaling oneself as a member of an in-group and/or excluding those who are not.Shibboleth got renamed to Froghome, I’m ¯\(ツ)/¯ about that one but fine.
There's a scene from the West Wing that shows why it might be an issue pretty clearly, but in the interest of avoiding IRL political/religious discourse, I'll link to the Wikipedia article instead.

Shibboleth - Wikipedia
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