I the SaaS is Open Source, you can always host it yourself, or pay some one else to host it, or fork it, or any number of other solutions if the current provide

I the SaaS is Open Source, you can always host it yourself, or pay some one else to host it, or fork it, or any number of other solutions if the current provider does not fit anymore. Open Source is the best way to fight vendor lock-in. If not Open Source, it should use open standard APIs and data models, with free or cheap data export.