Te "AROS is probably illegal" statement was made several years ago.
Offcourse they fear new competition. In a market as small as this one, every customer counts. Not only this, but any newcomers will be deciding between an Commodore Amiga running AROS and AmigaOne running OS4...
How many of those newcomers will go for the 2000 euro Aone not capable of running anything else other than OS4... not many. If any....