@neoncube: don't want to be a kill-joy, but have you ever thought about legal requirements regarding the courses you imported over to MLWL? Did Memrise give you any written (legally binding!) permission to copy and publish a) their own courses and b) all courses that were created by third parties?
The bits of info about ownership- or copyright-related information on Memrise are a bit sparse (but INAL, so it might be sufficient for them). All I was ever able to find is on their Terms of Use page (https://www.memrise.com/terms):
[…]
8. POSTING INFORMATION AND USER CONTENT
[…]
You warrant and represent that any User Content you do Post is either yours or you have the necessary permission from the relevant third party to Post the User Content.
[…]
By Posting User Content during your use of the Services, you grant to us an irrevocable, perpetual, non-exclusive, royalty free, transferable, worldwide licence (together with the right to sub-licence) to use, copy, translate, reformat, prepare derivative works from, incorporate into other works, excerpt, to distribute, to publicly display, in whole or in part, the User Content for the provision, delivery and promotion of the Services by us (“User Content Licence”).
[…]
I'm not sure whether it's even possible to transfer all third party rights to you, but unless Memrise explicitly did this and you had this checked by a lawyer and thus verified that it's legally airtight, all it might take is a single person to sue you …
