I don't plan to make any more bots for US-based NEXUS Enrollment Centers. The three existing bots cover the US locations that currently serve YVR / YYZ / YUL while the Canadian locations are closed. I don't think the demand is that high for the remaining US locations.

Port Huron in particular is close to Detroit, which has a lot of NEXUS appointments available.

Future bots will be for NEXUS locations based at major Canadian airports. If/when those re-open, there will presumably be a ton of demand for those spots.