Not sure if we are in a tech, “like to fiddle with things” echo chamber, but I would not recommend any of these tools to a team in general (even if it was a small product team).. slack and zoom and the likes (who all have free tiers) I find much better, simpler and successful to get started with.
Some people/organisations definitely do. (I would leave a company that decided to use Facebook For Work, and I wouldn't join a company that uses it.)
Purism additionally pretty much _have_ to take this stance for branding/reputational reasons, even if they didn't believe in it (which I'm 100% certain they do. This is _the_ moral imperative that is the core of their business.)