> I wonder if it's possible to make such a contract that works?

Yes. In short, you expressly identify in the contract that the provision is for the benefit of Oculus Rift users, and then they gain the power to enforce it as “intended third-party beneficiaries”.

https://en.m.wikipedia.org/wiki/Third-party_beneficiary

Thank you. Any examples of this in the field of computing, where users were made party to the contract of sale of a company in order to protect some aspect of their usage?

The examples I can find [there] don't seem to bear much similarity to this situation at all.

IANAL but my guess is that you could structure it in such a way that every user affected by the breach had standing to sue for some specified amount of damages so that collectively it would have been worth some lawyer's time to take the case on contingency.

It's entirely possible that FB would have balked, but that in itself would have been a useful data point that indicated that they had every intention of bundling the two products together.

In any case, the topic at hand is not so much whether such a deal could have been structured to work, but whether there are any circumstances short of willful ignorance where the founder could have made the promise he did in good faith. I don't see any.

Naivety seems to account for making such a promise, the idea that others have similarly honourable intentions to oneself can persist and cause such errors of judgement.