Don't blame it all on WotC. Didn't Lovecraft have a hand in that? And didn't Dagon appear (in approximately the above form) in D&D prior to WotC acquiring TSR?For example; Dagon BEFORE:
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(from pantheon.org's entry Dagon )
and Dagon AFTER the WotC Treatment:
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(as represented in Fiendish Codex I)