You can factory reset it.

I'm not sure about all Oculus products, but I had an Oculus Go and I was able to reset it, so I was able to sell it.

Idk where this comes from, you absolutely can. Hardware factory reset on Oculus Quest devices (both 1 and 2) is a thing. I did it myself last month, as I was giving away my Quest 1 headset, it is pretty simple.

It would be extremely strange if that wasn't possible.

You can't sell it? Is such a limitation even allowed by law?

Isn't there some sort of hard reset?