"improvements lasted more than a year after therapy"
Which is a good thing, given that it's not actually possible to use it continuously (at least not effectively, due to depleted serotonin). Which is also why folks tend not to get addicted to molly.
For this exact same reason, I bet the pharmaceutical industry does not like this idea. At all.
From my own personal experience, I absolutely credit occasional recreational use of MDMA (and visiting the associated raves, I guess) with helping me out of a not-so-mild depression couple of years back.