OH okay I see, I assumed it would be a co-op bundle, not a unique release. I don't think you can set those to not accept payment, but I've never tried.
In fact, we like explaining to people that if they do pay for it at all (including $1), that claims each title to your account. So like if I go to one of the item's Itch pages, it'll show me at the top that I own it, which is good cuz I often forget what I own lol.
We've done a few PWYW (pay what you want) bundles like this and they usually make more money than our paid bundles do 🤣