If you know you can't fulfill it then I believe it's all on you, in that you're lying.
Some fraction of people will believe you, and even those that don't can't know you can't fulfill it. There are plenty of legitimate life-of-the-company deals. One of them is buying stock. And there are plenty of companies that offer lifetime warranties. Only the person offering the deal has the information to know that they can't honor it.
And in this case, Joyent can honor it; it's not like keeping these servers running would put them out of business. They just don't want to honor it, so anybody who took this deal is so far correct in thinking that Joyent made a promise that they could fulfill.
Some fraction of people will believe you, and even those that don't can't know you can't fulfill it. There are plenty of legitimate life-of-the-company deals. One of them is buying stock. And there are plenty of companies that offer lifetime warranties. Only the person offering the deal has the information to know that they can't honor it.
And in this case, Joyent can honor it; it's not like keeping these servers running would put them out of business. They just don't want to honor it, so anybody who took this deal is so far correct in thinking that Joyent made a promise that they could fulfill.