It's certainly a shame about the small player base. For me, personally, it is a bit of catch-22, as the lack of expansions is exactly the thing preventing me from wanting to play Anarchrony on BGA in the first place!
If I could play with Fractures of Time, or if I could play with the Future Imperfect "All In" setup (Intrigues of the Council + Hypersync Future Actions + Quantum Loops) then I would be on BGA playing this every day! Heck, I'd probably be playing Anachrony on BGA every day with even a *single* Breakthrough-using expansion implemented. I really love this game. But without an expansion that makes use of Breakthroughs, playing Anachrony just feels incomplete to me. It would be like if BGA had an implementation of Gloomhaven, but didn't include any of the scenarios/missions, only allowing you to play a randomized dungeon each time. Sure, I can still "play" Gloomahven, but it doesn't feel
complete.
Maybe an imperfect analogy, but for now I'll keep playing my physical copy of Anachrony, and whistfully hoping for expansions to the game to come to BGA