The full sentence is:
This license allows you to install or operate the AmigaOS only on a computer system that had a version of AmigaOS installed on it at the time you acquired such computer system, which was especially prepared for running AmigaOS through the use of a dedicated (flash)rom or similar mechanism or for which a legitimate version of AmigaOS was or is available.
The last part (which may or may not be an addition), allows the purchaser to install 3.1.4 on a wedgie. Also, Amiga Forever comes with licensed ROM's and licensed Amiga operating systems. Where's the problem?
Are problems not just being seen where they don't exist here?
