Any commission-free equity brokers for C2 now?

C2Broker closed, so there goes my hopes to get a commission-free equity trading spot with one of my C2 strategies that deserves it. Are there any commission-free brokers known now to use with C2 autotrading?

Does anyone know why C2 Broker shut down?

It was hard to compete in a zero-commission world, and we determined it would be very expensive to create an offering comparable to Interactive Brokers’ multi-asset class support.

What is the possibility of getting Alpaca listed as a commission-free equities broker usable for autotrading or for broker transmit with C2? They seem to be gaining traction and features all the time, and have just added short selling.