Someone (anonymous user) tried to edit in a link to open5e.com to one of my answers, and another one. I tripped over the edits via comment notification, and I rejected them both with the cause "harmful" -- I am not familiar with the site and something didn't smell right.
That the editor came up as "anonymous user" for the proposed gave me a bad gut feel.
Personal opinion: editing in links to someone else's question or answer is one of those things that is sometimes helpful, and sometimes not. I'd prefer it be discussed in comments, but that's not required. The SO/SE guideline on links being added to another's post is supported in this blog post at SO on editing guidance:
•Linking to other resources related to the post
Perhaps the user was trying to be helpful along those lines.
Did I overreact?