For those forced to use Slack, I found this helpful open-source Firefox WebExtension called “Don’t slack-redir links” which “prevents Slack from replacing links with slack-redir.net, while still protecting privacy (against referrer leakage).”
https://addons.mozilla.org/en-US/firefox/addon/dont-slack-redir/
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@andreas If you want to try Keybase you can try and import your Slack team into it.
https://keybase.io/slack-importer
