Having unique one-time (non-reusable) invite ID is great.

The wat SimpleX uses one-way queues, and then distributes those queues among servers offers a way to mitigate communication correlation (if the servers are independent and won't collude). Or you can just self host and not worry. Self hosting an onion service is easy.

Running SimpleX through a tor proxy (or VPN) offers even more advantages (if you think you need them).

Perhaps the only downside is SimpleX still controls who gets to be a public server (anyone can self host or offer servers, but they won't be integrated). I have no way of knowing if the servers are owned by a single entity. This part is not "open".

Glad chomp/silence has worked out for you. Btw...SimpleXChat is different by protecting your social graph and not needing to share your private profile ID to contacts (via one time use invite codes). Can also be used on iOS/Android and hoping one day a desktop app GUI (not just a console app). Also has audio, video, file transfers, and groups. If really into privacy, you can host your own server and/or use Tor. https://github.com/simplex-chat/simplex-chat#roadmap

What has really impressed me is how they are solving some of the industry problems (decentralization, privacy, metadata, etc); it's not just another communication platform, it's different.

I'm curious if the most up to date version, v4.2.1, has the battery consumption issue (or if there's a configuration setting to change). Maybe it is just Android, not iOS, and curious about the differences.

The developers are very active and responsive, so I hope if the issue still exists it gets reported and the devs have the opportunity to fix it.

Did you report the battery problem on github or their subreddit?

I've also read these recommendations:

1) Switching from instant notifications (default) to periodic - some users say it does reduce battery usage.

2) If you are often reconnecting to the messaging servers - it may be happening on slow/unstable mobile networks - please try enabling dev tools and then increase connection timeouts in advanced network settings. It might result in fewer reconnections and reduced battery usage.

KeeWeb

Tribler does not use Tor, but its own onion network.
Tribler does not require you to be an exit node.
Tribler allows you to select the amount of anonymity/hops, or none.
Tribler allows you to organize into channels, and people can subscribe.
Tribler is a torrent engine, so the data has the potential to be distributed (availability/speed).

For clarity, it doesn't use Tor. It uses its own onion/relay network. The website says "Do not put yourself in danger. Our anonymity is not yet mature."

That depends on your threat level and danger. I use it to avoid DRM violations and my ISP, and it's been 100% mature for that. I have no other "danger" or need of "anonymity", so it works exactly like I need it to.

The other option is I2P or something like BiglyBT+I2P plugin.

Check out Tribler.

Is Greasemonkey better/safer/pivate than Violentmonkey (Firefox)?

How well does it work on iOS?

Need to learn how to buy and use digital currencies privately, anonymously, and avoid tyrannical governments. And at the same time avoid scams!

Whonix Gateway.

What's the best AUR package? Or should I be using .jar?

I think Briar is capable of relaying messages. As long as Briar users come into range at some point, messages will be exchanged.

I'd be interested in battery consumption issue.

Many of the top tier messaging platforms are trying to solve today's problems and vulnerabilities. I like that Tox does not require a huge centralized infrastructure (only DHT) and is P2P. Tox is very fast and works well over Tor too. However, P2P, DHT, and limited infrastructure has it's own challenges.

I think Session and Status.im are better positioned.

If a device is compromised, the adversary can do whatever they want: screenshots, keyloggers, fork Signal and install their own client.

Are most of the public XMPP onion servers robust (Calyx doesn't even have a V3 address)?

I like that a XMPP node can be hidden on the Tor network, however I have some concerns on the safety of connecting to Tor, even through bridges (if a government can setup a bridge and then monitor connections).

I like that XMPP servers can talk to each other.

The gossip protocol is interesting. Have also been interested in swarm, Whisper, devP2P, libp2p.

How easy would it be for a government (USA), to block or attack Matrix/XMPP servers, or place the people/admins using them under surveillance? How resistant is Matrix/XMPP in China, Iran, and other places? Is there something better?