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There are two different types of ownership here, and you’re conflating them.
One is the ownership of a digital copy on the same terms as a physical copy. That allows you to resell your copy, lend it to a friend, move it to a different device, retain the use of it even if the seller no longer exists . . . stuff that falls under the first-sale doctrine and other actions that are generally accepted as “okay” and reasonable. That’s what’s being called out here as not existing for most digital copies.
The other is the ownership of the copyright and permissions to reproduce additional copies. However, that isn’t what most people expect to get when they’re purchasing a copy of a media work, regardless of whether it’s digital or physical. How IP in general and copyright in particular is handled does really need an overhaul, but that isn’t a problem specific to the digital world—it’s equally applicable to print books, oil paintings, and vinyl records.
And to be honest, I’d prefer to see “lease” lose its meaning than “buy” go the same way, because apparently we can’t have both.
Maybe you should post a new article about copyright reform if that’s the topic you want to discuss, rather than trying to drag it into a discussion on a different topic. This one’s about false advertising of digital leases as purchases, which they are not even by the definition applied to physical copies.