In order to execute Olive Outcome strategies, you must be approved by your brokerage to trade on a margin account, but you do not need to use margin to invest with Olive. See also option approval levels.
Olive Outcomes combine buy and sell side options that allow you to execute the trades at no cost or even collect premium at the outset so there will be no change to your brokerage account balance at inception. Every outcome however clearly displays a "required investment" which is the amount needed to buy the underlying shares and also represents the maximum amount you can lose on a particular outcome strategy.