I think you might be confused about the two different types of challenges that there are
- Automatches
- Custom Challenges
These have separate control settings for rank ranges.
I wrote this up here:
This might answer the first part of your question.
The second part, about there being silly rank ranges, is a bug currently still open (27k etc) with no update from the devs that I’ve seen.
(Adam explained the other point, about new people being “15k?”. A feature that is deliberate, but causes no end of confusion and debate).
GaJ