The concept is great, a human-usable video conferencing system that doesn't suck massive balls.
As for the privacy, that's more nuanced. In terms of thirdparty access/security, its almost certainly more secure than the traditional suppliers(I'm looking at your authentication cisco...)
The nitty gritty is data collection by the company it's self. Thats harder. If your VC system uses android under the hood, then you have no privacy at all. Your data is funnelled to google at a minimum, some app vendors, and the company that made it.
Apple, its held in many secret silos in apple land, and not even apple knows which team has what data.
Facebook, now, they need a hardware platform, and this is the first step to getting there. If they were clever, they'd be prostrating themselves demonstrating that they are reformed, that they are full of trust and junk.
But as they are still clinging to the "its not our job to police the myriad of crap people advertise on our site", I don't think they understand. This kind of pressure should force a change, as facebook are publicly traded.
The problem is that tech journalism isn't really journalism. Its unquestionably adding breathless hot takes to PR, or if you've been burnt, unfailingly shitting on every product made by said company.