Great, so now when I am contemplating using, and paying for, your web app or service, I need to not only think about the possibility that you'll "pivot" or just go out of business, but also that you'll decide to "prune" the product that I'm using.
Companies prune under-performing services or products all the time--nothing new. The key is allowing customers to exit gracefully:
1. Give them their data
2. Suggest an alternative
3. Give advance warning
4. Thank them
I think this concept predates Google Labs. Not sure if they were the first significant cloud-based product to do that (likely they weren't). But even before the cloud when one has all of the software on their own machine, there was still a risk that the company that made it will pivot away from it/go out of business and stop providing fixes, etc.
I would say this is acting with integrity.