I think my response to this will just be a rehash of what I’ve already said. But anyway:
Advertising, which is what Facebook really is, is vastly different contrasted against functionality. It is an apples and chicken comparison.
That analogy only works if Purism was telling people to use Facebook, which they are not. They are actually doing the very opposite in every facet of their operation as a company. Having a facebook account and including G Suite applications with their products are two VERY VERY different things, not analogous to each other at all.
On top of that, since Purism has planned from the beginning to give us software that performs the same functions as the G Suite of apps, I really don’t see this analogy as even being worth debating.
However, on a different track, while Purism itself might be against the use of Android apps for example, since many are not FOSS or aspire to ever be, they are not going back on anything they say, if they as a company make it possible to install android applications on the Librem 5.
This is the same thing as me installing Windows on my Librem 13. Or using proprietary software in PureOS.
This is also a huge part of Freedom as Purism defines it. Being able to do whatever I please with the product I bought. It is mine.