With free models you get what you're paying for. Be thankful that people are uploading their work for you to use for FREE, instead bitching and looking for ways how to report what you don't like. Cgtrader does not have enough resources to moderate paid models and you're asking them to police free content? Don't be ridiculous. Give likes for the models that you find useful, leave polite messages in the comments section for the models that you think have issues.