It seems reasonable to me to ask, since otherwise they have no way to ask you to stop breaking the site.

There are better ways to do this, they just haven’t been built yet.

Eg this may not need actual contact info. Wikipedia just wants a way to ask you to stop. Anthropic could add an opaque agent/session identifier that Wikipedia could flag, and Anthropic just forwards that on to you in the UI.

If you don’t have free text fields it’s usually not super useful for spam. There are ways to get a binary “good/bad” signal back without that though.