I have a paid subscription and have been playing a lot of SecDim. I now have this banner at the top of every page:
You have 2 challenge attempts left. Please upgrade your subscription plan
I don’t know yet if this is a daily cap (since it has just started) or if there’s a soft cap on all accounts, but I am not going to do any more challenges until I get clarification as I would like to use those attempts on Mid Year 2023 Competition.