Hi!I noticed a new trend quickly gaining popularity and importance. Rumors say even Lineage is going to move to Substratum.It is marked as GPL3 and should be buildable (probably).
Feel free to add them to the "submission queue" aka "request forpackaging":
The Android app has non-free dependencies like Firebase...
Actually the RFP is already there: https://gitlab.com/fdroid/rfp/issues/57