Link over-optimization occurs when Google notices that a large proportion of the anchor text in backlinks pointing to a website shares significant similarities. This phenomenon arises when link-building efforts involve soliciting inbound links obtained through methods such as purchases, exchanges, or automated comment spam campaigns. In these practices, the desired anchor text is explicitly specified in the requests or configured in spam tools, resulting in its repetition across a large number of backlinks. For Google, this over-optimization can be interpreted as an attempt to manipulate search results.

Conversely, when inbound links are obtained naturally and organically, they are generally distinguished by varied wording, reflecting the initiative of their creators. Excessive over-optimization may necessitate a delicate de-optimization process or the use of a cleanup procedure to avoid potential penalties.