You may, if your carrier goes sour, for your own phone, to continue because their gone, flash your own phone, and not receive any monetary gain (it's your phone), to make your device worth it's value.

You can not gain commercially from your own property, given your just making it work again. You will labor.

Not everyone knows how, is the problem.

Also that example indicates the company is gone, therefore you should have been given notice by them ( an ok), nor could they pursue you, given they non provider of services, no rendering.