My best guesses are “eksciti(ĝi)” and “furori(gi)”. Are those good enough or am I way off?
The radical furor- seems a good starting point to me. Sometimes "hype" has this meaning of exaggeration. This can be expressed by "tro-" as prefix.
Ĉu la sukceso de Duolingo estas dauripova aŭ nur trofurora.
You might also consider distrumpetado ("widespread trumpeting"), (dis)famigego ("great (broad) promotion"), tamtamado, misfuroro, reklamaĉegaro, etc, limited only by your knack for metaphor and tolerance for lexical whimsy.