Tbh I havent either. I just thought it might be something people make tea out of in a dystopian city. I did a search and found some moss tea examples for you to look into.
https://www.perfectbrew.com/blog/how-to-make-sea-moss-tea/
https://www.healthline.com/nutrition/icelandic-moss
https://www.khromaherbs.com/blogs/news/irish-sea-moss-benefits