Digital pets have existed for decades, but most are scripted animations. A pet driven by a real neural simulation would feel alive in a way pre-programmed behaviors can't match.
Package the FlyWire connectome or similar simulations into an embeddable desktop pet framework. Users could adopt different organisms (flies, fish, etc.) with unique behaviors emerging from their neural architecture.
Monetize through premium pet skins, rare species packs, or a marketplace for user-created neural models. The core tech could be open-source while selling customization.
Start with a simple macOS fly demo, then expand to Windows/Linux and more species. Add customization options as the simulation proves stable.
The main risk is performance - neural simulations are resource-intensive. Would need to optimize for running in the background on average computers.