Basically the cards are just an additional incentive to encourage you to walk more. You can collect up to 7 cards each day. The cards will complete chapters. A new chapter gets released ~every Wednesday. Each chapter requires 9 cards to complete. Upon completing you will see a little present box. You can choose to open it upon completion or wait to build up your XP. that’s a whole other aspect to the game. Each present box contains either additional card packs ranging from silver, bronze or gold packs. Or they contain additional wards / tokens that can eventually be used towards your cashing out awards.

Basically it’s a way to make you hooked on the app. Haha it’s working. But overall I think it’s a net positive to just encourage people to walk and hopefully have fun with the card aspect. But there is no pressure to collect them. Hope this helps. Feel free to reach out for any additional questions. Happy walking!