[Volundr]

> Sure it's not their fault. It's not the current management's fault either, that's the problem.

It is the current managements "fault". They bought the company, all it's assets, all it's liabilities. They don't get to conveniently decide they get the company, but none of it's debts.

> They were promised that someone else would reward them.

They were promised Twitter would reward them, by people with the authority to make binding promises on behalf of Twitter.

> That looks like a problem coming from the first employer.

There is no first/second employer here. They were employed by Twitter before the acquisition, they were still employed by Twitter afterwards.