Congratulations on your success
@Aspiring MD-PhD! I'm sorry you had to turn down the offer despite it being a great fit.
The spirit behind the affiliate program as many see it is to expand the program and thus the pool of MD-PhD seats available nationally. Of course, this effort has a very real flip side ... not everyone can be guaranteed full funding, and the ramifications can be particularly large for trainees who are more constrained financially. I don't condone this, but there are always efforts to expand funding for trainees.
Avenues for individual support feel adequate to most, I bet. If you need advice or have feedback, you'll find someone to speak to. There may be exceptions, but I'm guessing that's the case everywhere!