The issue was settled some time ago when OSHA tried to enforce the GFCI requirements for a fountain where a change in Article 680 cleared that up in the form of a fine print note.
Now, see the definition of a Fountain.
Fountains, ornamental pools, display pools, and reflection pools. The definition does not include drinking fountains.
Question: Do you think that a drinking fountain should be protected by a GFCI?
If so, why?