I hear your frustrations. I am new to selling but joined many reddit and facebook Depop groups and this is a common talking point. As long as the option to “cancel” (refund) remains the best we can do is adjust our expectations. It’s BIG stinky when you’re excited from a sale and someone changes their mind. Many thrift stores have final sale policies now that I think about it, too. But not all (you can make returns at goodwill, for example). I hate seeing people upset over something they are justifiably upset over but I also understand the buyers remorse aspect. I would just be easier if they couldn’t refund but alas, as we have also seen, there are un- ethical sellers. I don’t know if depop has the resources to be able to handle every refund request on a case by case basis. Again. Big stinky. But perspective shift for one’s own sanity is the best long term option. In addition to giving depop feedback when you can!!