https://www.vice.com/en/article/n7vq4k/thousands-of-users-un...
IOW, even though they say they don't want to control your conversation, they do want you in their hands.
Can you run it? Sure. Should you?
Please excuse me for being direct, I do not accept your defeatist attitude on this one. You won’t have stickers, such a shame, but you would have the ability to create your own signal service
But it doesn't. There are options. If I had to choose, I would rather invest this time and money to collaborate on the existing protocols that do have the goal of being fully open. Matrix and XMPP can do the things that I want and there are plenty of people working on them to overcome the present issues and challenges for mass adoption.
Why should I swim upstream by myself if there is no special reward for this kind of effort?
I know you are a nerd but your users are not.
However, my mother does use Element to talk with me and it wasn't that hard to help her download an app, tell her where to put the username and what is the name of the matrix server and quickly she was on her way to start a call and setup a room with the rest of the family where I share the pictures of her grandkids.
My users may not be nerds, but they are not stupid. They can learn.