YouTube has banned links in comments and descriptions for Shorts due to a wave of spam
You need to introduce the following system:
Anyone who wants to add their own link to the description of their video must first check 2 other people’s links for possible fraudulent content. Moreover, one or even two of these checked links must be specially generated by Google’s neural network (fraudulent content must be embedded in them). If a person tries to evade a thorough check of links, then the ability to add links to the description of videos is blocked on his channel for 1-2 years.