I actually tried Tox - maybe 8 years ago now… the real problem with it, or anything similar, is that you need both ends of every conversation to take the trouble to set it up. It was pretty easy to setup, IMO, but… as an example, in 2005 I had an engineer co-worker ask me about “that Linux thing” when I got around to telling him that pretty much everything he used on a daily basis was available in Linux, just under different names than he was used to in Windows “Oh, you mean I’d have to learn different names for Word and Excel and Outlook?” “Uh, yeah.” “Oh, that’s more trouble than I think I want, I’ll just stick with what I know.”