I got distracted from my work so I made some Continuwuity propaganda. Continuwuity is a lightweights Matrix chat server that you can self-host pretty easily. Give it a try :3
I know you are in good faith (and I already run my continuwuity server!), but in ppractical terms you are suggesting to use Google, and I don't want to. Expecially for something you could have included in text in the post.
edit: I am reminded of Richard Stallman spelling out full URLs during conferences, complete with subdirectories. It is silly, but it works.