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nemo If someone decides not to honor redactions, they're going to have a whole bunch of Child Sex Abuse Material, gore and other disgusting content in their chat logs. There will also be the endless harassment, fabricated stories and other content posted during raids. In practice, every multi-user server that's allowed to use our rooms honors redactions. The content is still kept by the servers for a certain amount of time after being redacted but only room mods on servers enabling fetching redactions (which we do for the grapheneos.org Matrix server) and the server admins can view it.
Another thing to note too is the more platforms you support, the more resources it takes to manage everything (not sure by how much, but I wouldn't be surprised if it was exponential). So I understand the fact that the grapheneos community simply can't create a bridge to every protocol under the sun.
Each platform adds a lot of moderation overhead, especially platforms without full support for the bridge such as IRC and Telegram. IRC lacks message deletion, so if IRC starts being raided we're going to disable sending messages through it quite quickly.
I'm very glad though that irc is still an option, even though I'm not as comfortable knowing that my messages are being relayed to discord (which doesn't affect me as much because I mainly lurk).
Our rooms are completely public and get public archived at https://view.matrix.org/ which is search indexed. Anyone who wants the content of our rooms can easily obtain them. Bridging to Discord doesn't reduce privacy for people using the room on other platforms. Discord can access the content regardless, as can everyone else. There are no doubt AI models being trained on public chat rooms.