Since backlinks directing viewers from their respective corners of the Internet to a particular website are such an important factor in that website's potential rankings on the results pages of Google and other search engines, many would think it is only logical that a website can easily be adversely affected by backlinks located in particularly toxic environments. Google does provide a tool that allows website owners who feel that harmful websites elsewhere that have seen fit to discuss and link to the site's content should be disavowed in Google's ranking algorithms, but this utility is rarely used.
Google is quite capable of discerning whether a backlink is to be considered "bad" even though it may not have the "nofollow" element that is ordinarily supposed to prevent supplying "link juice" to the URL in question. This is why it is never recommended for web owners to pursue black hat tactics that result in "dofollow" backlinks formed inorganically, but the procedures that Google takes to prevent degenerate ranking credit from supporting a website also protect that website from problematic external efforts to influence its SEO rankings. When a website starts gaining widespread public awareness, hundreds and perhaps thousands of backlinks will appear for the website's benefit without its personal involvement regardless, and Google is good at filtering out spam.
Even if using a tool such as SEMrush to detect a website's current stable of backlinks lets a webmaster discover a working backlink that has appeared at a URL he or she ideologically disagrees with, it is usually not recommended to use the disavowal tool to stop that backlink's effectiveness. The ranking credit the URL is giving to the website may well be purely beneficial, and the site's owner can do little to reliably determine that the credit is not helpful. The disavowal tool can be quite useful, however, if the website's owner had previously made a lot of backlinks appear through black hat tactics but has since come to appreciate more ethical methods of social outreach; in this case, the tool can be seen as a means of cleaning up. For more information click here https://www.reddit.com/r/SEO/comments/cfncwd/howdoidisavowbadbacklinksonanongoing_basis/.