He’d open sourced his Achoo app in the past. All it led to was copycats pretending they are not copycats. No attribution and the whole nine yards. If you google it, there still might be remnants of the incident. So I wouldn’t hold out hope on Apollo, rightfully so.

You'd likely have to enter an API agreement with Reddit, and it's unlikely they'd be willing to run you through the sales funnel and write up a contract just sell you what's effectively a $3/mo API plan.

That said, open sourcing the app would be great to archive it for posterity.

Or adapted for another platform. Open source UI means you need basically the database adapter to set up a clone. Betcha a lot of current Apollo users would swing onto that new platform.