@weasel In addition to everything said above, a couple notes:
- The RFP template includes the statement The original app author has been notified, and supports the inclusion, (not just doesn’t forbid, which is what Signal devs are doing, per your link) which is above & beyond the open-source licensing, but is a current F-Droid official repo inclusion requirement.
- If you’re just looking for a way to install/update Signal via the F-Droid client, try adding (currently) the repo(s) from Ember &/or Platschi, both listed @ the wiki Known Repositories.