Did you even read the article? Someone took ISO and modified it for re-distribution which is piracy. It has absolutely nothing to do with disabling features on your own Win10 installation.
Maybe the linked article has been updated since you posted, but this is not true of the current article.
Yes, they were distributing a modified ISO and it probably should/could have been taken down on straight copyright grounds. But the article is about the fact that rather than concentrating on this clear violation, the DMCA complaint specifically calls out the modifications as infringing because "the link provides a work around technical restrictions of the software". This distinction is directly addressed in the paragraph that starts "At first view, some may conclude that Ninjutsu OS amounts to a heavily modified yet pirated version of Windows 10."
Seems like you can download Windows nowadays, and you need to buy the license key separately. I am wrong? (I ask naively, because I am not a Microsoft user)
Yes, that is how it works, and you can buy a key right inside the Windows Store app so you don't even have to go digging in Microsoft's website nor a reseller site.
