Now, after several months it seems that its managers have changed the license type to return to the App Store and also be present in the Windows 8 application store.
The GPL license used so far is not compatible with the terms of the respective shops. This causes a conflict and Microsoft could leave the application out as it did with Apple. By changing the license you can ensure that you are in both stores.
Perhaps many see the movement as strange and do not agree with the change of license. I think it’s worth it. Firstly because, at least for me, it is a good application in its desktop version and I already liked it when I could use it in iOS. Second because with the explosion of mobile devices having a presence on those platforms gives them important publicity to attract more users to their version of OS X, Windows or Linux.