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I do exactly this with Armbian and an Orange Pi Zero 3 for a little Home Assistant display.

Autostart a browser in kiosk-mode on boot. Nice and simple.

I also made an image of that SD card if I ever need to set up another.

I don’t have any idea of how to manage a public facing service but I will figure it out.

Terrible move.

What if someone puts something illegal on your server? How do you know someone hasn’t done that already?

You will be surprised at how much you can do with very little and very old hardware.

Why not any of the other Matrix clients? I’ve got some friends on Element with some bridges and it’s pretty much perfect.