There is also a 3D spinning globe, so that too.

But, background is dynamic. You can see it has some kind of fancy moving dots. It’s totally unnecessary, but clearly WebGL was used for that.

This was my experience. Every time people suggest it as a Discord alternative I’m like, have you actually tried it? I hate Discord as much as the next guy but Matrix doesn’t get anywhere close. I tried really hard to like it and give it a chance, but no.