I love the idea of this site but I don’t understand the pricing model. It says 30$/month but I can only pay 120$ for 3 months. It should be 90$ for 3 month. A

I love the idea of this site but I don’t understand the pricing model. It says 30$/month but I can only pay 120$ for 3 months. It should be 90$ for 3 month. A monthly payment model would be more accessible. I do I misunderstood something?