There's no catch. At Gnosis, we’ve been proudly building an open and fair internet in the open for over ten years, with money from a round of public funding in 2017. Gnosis App is no different. The CRC rewards are partly subsidized by the Gnosis Ecosystem and partly by the users' own activities.
As you use the App, getting marketplace offers like topping up your card, buying GNO as a discount, or paying app fees for other transactions, you participate in value creation.
Part of this value flows back to you in cash back, almost like a kind of dividend. No one except users can generate CRC. Every CRC that we distribute as cashback comes from someone.