That is sad; both my kids took a variety of CTY online and in-person classes, particularly some of the AP courses that their high school did not offer. It was a great resource for us.
However, while we didn’t have experience with the more advanced math courses, I recall that CTY’s online AP Calc offerings were just re-packaged Thinkwell courses that were starting to look a little dated. They were also a little spendy, and some CTY students struggled to find brick and mortar high schools that would actually allow them to sit for the AP exams, particularly after the pandemic. There’s also been a pretty significant organizational restructuring at CTY that began after the well-publicized blowup at their summer programs in 2022 and the removal of their previous Executive Director.
Probably a variety of factors driving them to restructure their online program offerings. At least there are other online options available for advanced math.