Why does any source code exist then? What is the point of GitHub with codebases that are 7+ years old? Would mass adoption of the outdated server force updates or god forbid a fork of the code base?
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
If Signal was the only alternative to have an internal messaging tool, sure, it would make sense to invest time and money on it to keep it up.
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?
My grandma does not use any kind of phone, so it is going to be hard to get her to Element or Signal or anything.
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.
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