Couldn't you do the same thing with github.io, S3 Websites, Netlify, the list goes on? Why would they single out JSFiddle among numerous services where one can upload arbitrary code?
There's the theory that misspellings in a Nigerian email are meant to filter only the truly gullible, but IDK if that is true.
I think the crazier misspellings with wild character substitutions only started after bayesian spam filtering.
Nothing proves the scammers are not using those other alternatives for all you know.