I hadn't noticed. I believe both kinds of bows are in play.
These are pictures of the Bass Orchestra and Rabbath master class.
The age range for the camp is about 8 to over 70.
I'm volunteering (helping herd students, tech support for the concerts, and writing a new registration database system).
It's all double basses, so I brought in my Stagg EUB (popular with the campers), my Ashbory (especially popular with the younger students) and my Series I (popular with the teachers).