Sorry to hear that they have removed that option - it is essentially a price hike on people in MD and other states with SREC programs. I would guess it is a combination of profit motive and them trying to take control of all paperwork as they now also seem to file for at least the MD solar credit on your behalf. They may have found it was actually easier for them just to submit everything than to support customers in doing so.
For those curious,
SRECTrade | SREC Markets shows a map of states they support with SREC markets. It is only a small number - IL, OH, PA, MA, NJ, DE, MD, and DC. And, as I understand it, IL, MA, NJ, and DE at least have transitioned away from traditional SRECs for new installs. OH does apparently allow neighboring states to participate, though it also pays very little for credits.