This attempts to obtain the benefits without the costs and ongoing effort that commands value. California grid operators aren’t going to deal with system sizes this small (5-25kw) individually, hence the orchestrator (Tesla). You could build an orchestrator (I highly encourage such an endeavor for competitive reasons), but a standard alone is insufficient and of minimal value. Same reason you don’t get paid much to shed load (token amounts), Google via Nest does.
With that said, you can operate autonomously on the grid with solar and batteries (and the inverters will sync and follow grid voltage and frequency), and can even use export restrictions so you never send power back to the grid (curtailing) if desired; but energy marketplace participation is much more than that. Enphase and SolarEdge (inverter and energy system manufacturers) are positioned as competitors to Tesla for VPPs, but haven’t made the effort (that I’m aware of).