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Just curious … what does this mean for signal - does the Guardian Project do funding / infrastructure / code? I don’t really know them.

Signal is not on F-droid. There is no Guardian repo on F-droid. The link you posted directs to the Guardian page about Signal, but nu info about Signal being on F-droid

Edit : found the repo on https://community.signalusers.org/t/make-signal-available-in-fdroid/2608/161

Guardian repo: https://guardianproject.info/fdroid