If you need any help or run into any issues, feel free to ask here! Whether it's a problem with your Qwen voucher, questions about using Qwen, or anything related to the development of your game, we'll do our best to help you out.
Just got this answer from Qwen team:
"Unfortunately, yes. According to Qwen Cloud’s policy, participants need to set up a payment method before they can use the voucher. Please remind them to keep an eye on their usage to avoid any unexpected charges.
Every new Qwen Cloud user also receives 1 million free tokens, so they can use the free quota first."