Does this support other targets like twitch VODs?

Huh, you’re right. But a few weeks ago I was definitely able to download via Fido. Maybe try that.

Maybe https://servers.guru/

Never had an issue getting an iso from them via Mullvad.

Mattermost does not have E2EE to my knowledge.

Not E2EE though, or at least not fully.

XMPP only does it with certain client extensions. And Matrix only does it when the rooms are set up this way. SimpleX does what you want, but is kind of unintuitive for the average user.
I say go with Signal, it does what you want and is idiot-proof.

I didn’t have much luck with Bottles in the past, but this is entirely anecdotal.

Consumer CPUs were lacking ECC reporting, so you never really knew if ECC was correcting errors or not.

Shit, this kinda screws with my plans to use the A380 as a transcoding card for my server.

There’s a way to run the client on Linux now? Awesome!

Old smartphones, old CPUs/GPUs, some SBCs.

Depending on your jurisdiction. Big asterisk.

You’re right, I forgot about the on-the-fly transcoding abilities of Jellyfin for a moment. But still, the server should be able to handle whatever codec they choose in hardware.

Keep in mind at least your server should be able to decode whatever you choose in hardware, so AV1 might still not be a good idea depending on your current hardware and upgrade plans.

With current hardware support I would advise against using AV1 or even H.265.

I’d recommend to experiment with H.264 and low CRF values to see what quality loss and file size OP is comfortable with: https://trac.ffmpeg.org/wiki/Encode/H.264

Yes, the only real drawback is the single channel memory connection, but that’s rarely a bottleneck.

I’d recommend to go with some form of mini PC. If you don’t need much CPU power there are some very cheap N100 ones where you can upgrade the RAM.

If you need E2EE there’s only Matrix. I wish it wasn’t the only option, but it is. For setting up rooms and so on you can use their Spaces feature, I think.

I’ve been looking for an alternative, too: https://feddit.de/post/8502516

From the ones you mentioned only Matrix supports full E2EE.