In Mexico these are called tandas (singular: tanda) and they are also paid directly to the person whose turn is to collect. Sometimes they even have themes, including plastic surgery – I’ve seen this theme mainly among cis women either with liposuction or breast augmentation, including the commitment to take care of each other post op, sometimes involving other family members/ friends for that part. I wouldn’t be surprised to see trans people organizing a susu / tanda for gender affirming care too.

I’ve never seen the equitable component before though, thanks for sharing.