I have recently left the network, Ecademy. I did not find it in any way useful
I had been a member of Ecademy for some time. Foolishly I had loaded a contact list at some point to determine which members of the contact list were also members of Ecademy. Recently, after a period of inactivity in Ecademy, individuals on that contact list was mailshotted by Ecademy, on my behalf, inviting them to become members.
I do not have the time to determine whether Ecademy was entitled to do this. It has certainly been a nuisance for all those mailshotted and for me.
Best reference I have come cross is this web post explaining how to delete your Ecademy account.