Is one who sells supplies and equipment for women's and men's salons sinful because they are used for impermissible things such as plucking (namṣ), considering him a promoter of them?

The email addresses of the two Sheikhs cannot be provided as they are unknown. It is advised not to sell tools and equipment for men's and women's salons because many of them are used in ways that violate Islamic law. However, selling is not forbidden unless one knows or has strong suspicion that they will be used for unlawful purposes.