There are often agreements put in place for situations like this, where the source code and instructions for running it would be put in escrow so that should th

There are often agreements put in place for situations like this, where the source code and instructions for running it would be put in escrow so that should the company go under or disappear in some way, their client would be able to carry on running the service in some form. I believe this happened with FoundationDB when it got bought by Apple. The bigger companies who were paying for it didn’t lose out too badly, although it’s obviously an inconvenience.