Earlier quoted context omitted.
If you live in a one-party state, secretly record them and then if Oracle threatens to sue, show them the recording and remind them of promissory estoppel. (IANAL!)
Not really promissory estoppel, which can enforce a promise if you detrimentally relied on it. It's not really to your detriment to use the product for free, so it's not a perfect fit (unless maybe your company hired someone to administer the VMs, specifically based on his VirtualBox experience?). Some other possibilities would be the parol evidence rule (verbal exchanges between the contracting parties and their eff…
Thank you!