Not at all. This just strikes me as desperation, jumping on the hate train against Facebook because it's easy. Instead I'd like to see them actually develop their container functionality into a mainstream feature for the browser that might gain enough attention to make people start asking why Chrome, Safari, or Edge don't do the same.

I could see it very easily existing somewhere between the "New Window" and "New Private Window" menu options. They'd just need to rebrand it as something other than "containers" for the masses to understand it. "Private Window" would have been good but unfortunately that's been taken, in hindsight they should have gone with something that more clearly convey's the "burned after reading" forgetful nature of the private window because I think private conveys secret/isolated without the self destruction that comes with a Private/Incognito window..

People understand the Private/Incognito window, it wouldn't be hard to explain that a container window exists somewhere between a regular window and Private/Incognito. They could also easily surface or suggest sites you might want to containerize.