I never bought a copy of a Mac OS, but I would bet you dollars to donuts that the restrictions on the purchaser are spelled out in abundantly clear language.
Of course they are. However, the common law doctrine of first sale should trump this because as I own that particular copy of Mac OS (or any other product), I should be allowed to do whatever I want with that product, be it resell it at a profit or loss, use it as a Frisbee, feed it to the dog, or whatever provided I do not make unauthorized copies of the product.
Apple's lawsuit should be thrown out. No business should have the right to dictate to me how I should use their product after I have purchased a legitimate, legal copy of it. If Apple wants to control who uses its OS, it should consider renting it out instead.
You said — I never bought a copy of a Mac OS, but I would bet you dollars to donuts that the restrictions on the purchaser are spelled out in abundantly clear language.
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I have bought it — but — I haven’t ever bothered reading it, even just one time, in over 25 years... LOL...
Who cares..., I use the Apple machines...