I totally agree that there are such unfortunate incidents where some buyers purposely make you do all the work and then try to scam you to get free work. Similar things have happened to me before, and that’s why I carefully choose who to work with and try to find out if someone is compatible before I decide to work with them. In the past, I’ve also encountered buyers who took my work for free, and nothing was done to protect me. Some buyers can find any loophole, even if there are none, and make up stories. It’s better to work with people who create a comfortable environment and are kind and avoid those who seem dominating and unprofessional.