I signed up on DMCA approx. 4 months ago. Now when I logged in to Google Webmaster Tools, and go to “links to your sites”, there are 7172 backlinks showing in which 6473 links are coming from dmca. com. Should I disavow them? Will it make any impact on SEO?
Its all your wish to disavow them or not. By the way, most probably they wont hurt your site and its SEO.
DMCA backlinks will not affect your site SEO however if you wish you can take down the link.
Remember just remove the code from your site and wait for a week or so, as the link will automatically removed from your list by Google.
Caution: Do not Disavow.