this is the kind of business that would blow up on tiktok. it's a niche business and people would be captivated by the whole process. theres a guy with millions of followers and views from cleaning pools for example.
i remember reading in order to make any plastic soft enough to stretch and mold (otherwise it's too brittle) additives like BPA are required. BPA is just one of many different options. BPA free doesn't mean endocrine disrupting free.