It seems that Apple is starting to get really serious with all the websites that contain words registered by them, and this time it was up to those of app4mac.com, who have changed their commercial name almost instantly, noticing the power of Apple at the back of their neck.
The new website of these guys has become xdna.com, which obviously has nothing to do with Apple in the name and with which they can be calmer than before.
If you try to enter app4mac.com, you will be redirected to the new website, so Apple has not controlled the domain ... something is something.
Source | 9to5Mac