If the performance is the point, then that's exactly what makes it performative. I doubt the people behind OccupySaaS agree that the performance here is the point, ie that they're doing this just to do it and expect zero companies to switch to their software.

No, you're using the word in the colloquial pejorative sense. This is a protest, and the fact that they are trying to make it visible in the way that they are is what separates it from something like a generic competitor that does something similar.

I understand what you're saying, this is a protest, so by definition it's performative.

But I suspect whoever is behind this doesn't want it to be just performative. They hope that companies will actually switch to these drop-in OSS replacements, otherwise what exactly is the point? The website? Mission accomplished I guess.