https://stoat.chat/

KDE Plasma has HDR support. You can check if your monitor is supported by booting from a cutting edge KDE distro like Fedora KDE.

It’s still there 😭

First of all: You don’t need end-to-end encryption for e-mail. Don’t choose something like Proton or Tuta just because of that (I highly recommend reading the linked reviews).

Disroot seems to be the only e-mail service which fits your criteria (though screen reader support will depend on what e-mail client you use I guess, not sure about Disroot’s webmail in this case but since it allows free accounts you can test it out for yourself.)

My main gripes with it were that its package repositories were really small and that a lot of installer shell scripts just didn’t work because they used GNU flags of coreutil commands, while Chimera Linux uses FreeBSD coreutils.

These issues can technically be “resolved” with Distrobox, but I just found the Artix Linux dinit version much more usable.

Vivaldi and Firefox are the best browser alternatives? Really? Are you sure it’s not Helium or LibreWolf?

And it’s really fucking sad that shit like ProtonMail gets all the attention while great services such as Posteo are ignored.

You could just use stoat.chat (formerly known as Revolt) instead of Root, especially with Stoat being FOSS and Root seemingly being proprietary.

You can use OnionShare to host a chat instance on the Web over Tor.