1. You can't leak what you don't have.

That is, even if the company gets bought out or is hacked, if they don't have the data, there is nothing to leak. This point is also at least partially enforced by another point from the post:

2. Advanced app users can audit their network traffic from the app

Now, granted, I wouldn't expect many users to do this, but highlighting it at least serves as a warning that it should be harder for the app to surreptitiously change what is sent to the server (and to emphasize, I know this can be worked/hacked around, but I don't think working around this could ever be done with plausible deniability).

Given the fact that companies and products jettison their high-minded policies as soon as it becomes economically inconvenient, the only other thing I'd recommend for the author is to have a good, simple export tool, e.g. something that dumps all the "memories" to a directory or PDF file. The post talks about backup and restore, but if I were a potential user I'd like to know that if the company does kick their privacy policy to the curb at some point that I could get all of the investment and data out of the app without needing to continue to rely on the app for at least the base data I put into it.