Indeed, and I could have prepared myself for the situation in any number of ways, including monitoring my components status, designing around the dependency, and so forth. I think. Not all suppliers make it easy to discover the status of components.

Do you think that a sole source relationship carries an implied contract of continued service? Should that be a regulation? I don't think I'd like that.

As I understand it, AWS didn't force Parler to sole-source their computing infrastructure. And Parler claimed that they had prepared for such an eventuality.

I don't know if it would apply to the current situation with Parler, as my understanding is that they did agree to terms of service, and that the dispute with AWS over their content moderation didn't come up all of a sudden.