Edge, the term, is really popular in IIoT/5G space. It's now a continuum of services - Cloud, Fog/Edge, Mist, Dew. I agree that some of it is just marketing jargon but Fog/Edge as a concept is now well understood.
References:
(1) Open Fog Consortium (https://www.openfogconsortium.org/)
(2) Edge Computing (https://en.wikipedia.org/wiki/Edge_computing)