Pyramid selling schemes are illegal under the Fair Trading Act.
They offer a financial return based on payments made by new recruits and the return is primarily dependent on the continued recruitment of new members, not sales of a product or service.
The commission said any individuals already involved in Lion's Share should cease their involvement and those considering joining it should not do so.
"Preventing harm from pyramid schemes is a current priority for the Commission. The schemes require constant recruitment of new members to buy in and inevitably people lose out financially as recruitment dries up."
In November RNZ reported that Cullen had held seminars online and in person stating Lion's Share gives people an opportunity to earn extra money.
In one video on YouTube, she claimed she made $154,000 from Lion's Share in less than two weeks.
She included a disclaimer where she warned people that Lion's Share was a risk and there was no guarantee they would profit from the scheme.
However, she followed that by saying "risk is the new safe".