John Mueller of Google provided an answer to an inquiry regarding the utilization of the link disavowal instrument and also gave some advice pertaining to the best way to use it. This tool was presented by Google after the Penguin algorithm update was discharged in October 2012, resulting in thousands of websites losing rankings. As mentioned in Google's official announcement from October of that year, "If you were advised about an inherent spam action based on "unnatural links" going to your webpage, then essentially this tool is not something you need to be concerned about." John Mueller responded to a query about scrapping connections to a site asset and proposed counsel on the correct use of the apparatus. He remarked that disregarding arbitrary connections that seem strange, or those a tool has noticed, is not a profitable utilization of your time. The lone connections that should be voided are ones you know were paid for or are a piece of a connection plot. Utilize the disavow device just in cases where you really paid for connections, and can't eliminate them in the wake of doing so. It may be beneficial to take into account that there could be other explanations for decreased rankings, which may be the result of the Panda algorithm impacting the website. It's essential to remember that what appears to be the most evident manifestation of the drop in rankings is not unavoidably the genuine one, just the easiest to claim due to its openness. Subsequently, revoking links identified by a tool and links that have not been bought is a waste of time.
(source: https://www.searchenginejournal.com/google-disavowing-random-links-flagged-by-tools/472891/)