The Discord link on ADSBExchange points to a server called "Airframes.io Enthusiasts" - going to the website shows:
> Airframes is an aircraft-related aggregation service that receives ACARS, VDL, HFDL, and SATCOM data from volunteers around the world.
> It is under very active development and you will notice changes from day to day. Also, issues are expected.
> Contributing your feed allows us to make ground developing new decoders and make important statistical observations. It also benefits users of the service so that they can see more about flights as they traverse covered territories.
Perhaps the original founders' work will continue here?
EDIT: It does not seem like the original founders has collaborated with the community on this, and the people there are just as lost as anyone else.