Yes, use of Buu.ai is optional for it's own prize pool, not required to win the jam in total.
- Voucher: We provide a voucher with free credits for all participants
buu-1a3bf32bbca11e - Prizes: free credits to winners, eg: 1st place receives $150 in credits, 2nd place - $100 in credits and third place $50 in credits from Buu