Topic: Bitly authorization fails - says APIs no longer supported...
... therefore it recommends falling back on using the OAUTH2 scheme. They changed it recently, was able to shorten links just a few days ago. I'm talking about Dropzone 3 on my older macOS on my older Mac.I'll update about High Sierra situation.
BTW, Google shortening fails too because Google complains about the obsolete OAUTH used by the appropriate action.