Womans arent making haram mens having 4 wifes or 2 or 3 but the woman saying tht before man marry her tht men have to agree tht they dont marry others womans while he is in marriage with his 1 wife tht is all and tht is not haramThat contract is actually invalid
You’re not allowed to make something halaal haraam
They can write though if you do get a second wife you should divorce me.