What does bjd mean by highlighting d?

BJD dolls followed by D, that is, piracy, infringes on the rights and interests of humanoid artists and is illegal.

It takes a lot of processes to make a Z doll and show it to everyone. Clay sculpture → plaster mold turnover → resin mold turnover → whole body polishing → wearing S hook on the whole body → designing and making make-up design clothes → taking photos and uploading them to official website. Moreover, the steps of D doll shop are very simple, buying Z dolls → flipping models → stealing official doll drawings. Secondly, baby D and baby Z use different resins. For example, baby Z began to turn yellow after playing for five years, and baby D began to turn yellow and crack after playing for one or two years.