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I think they meant "commodity" in the general sense of "something you have to pay for" or "something subject to market pricing" as opposed to something always assumed.

"Commodity" seems right. "Luxury" carries another sense that I think is fitting, too.

- Something useful that can be turned to commercial or other advantage.

- Advantage; benefit

Surely personal data is the commodity turned to commercial advantage? Personal privacy, or lack of is the symptom or consequence. Privacy is a luxury for those able to opt out, usually via wealth.

What I mean by "commodity" is:

Suppose you want privacy: You need to buy your way through to get it

Suppose you want something for free: You need to sell your privacy for it

Although your point is right; maybe "luxury" is a better term.