With the Free Plan, you can use and capture leads with Vyper until you reach 250 leads. The Free Plan does not allow exporting of the emails and the contest.
Once you've reached 250 leads and if you don't have a credit card on file, any further leads will become invalid and the contest will not be active. Old leads will still be there.
It is recommended that if you see that your campaigns are doing well, please put a credit card on file and it will auto-upgrade so you can continue to capture new leads seamlessly.