I would like to receive $50 for signing up. By marking the checkbox, I understand the following: Your account will receive $50 once you successfully sign up. You will not be able to withdraw funds so that your USD balance is lower than $50 unless your total balance has exceeded $500 notional for 90 days consecutively. If following 120 days since sign up the total balance has not exceeded $500 notional for 90 consecutive days, $50 will be deducted automatically from the account, otherwise nothing will be deducted from the account.
It seems they have an interesting clause for the $50, but its acceptable given the fact that they are giving you $50.
I would have followed through with Coinbase and their @edu campaign instead of this $50 free campaign.