I have a website in a local language where beside spamers there is almost no competition. But all top places on the first page of Google SERP are taking websites for which is very obviously that they are spaming forums and other sites. It looks like the following example (this is not my targeted keyword but just an example) They are posting replies or comments with literaly 50+ links in one post and no content. Do you think Google will remove all 6 sites if report them and show where they are spaming? How much time do you think it can take that they remove them from first page SERP?
Abusing will bring you nothing. Spamers have hundreds of sites. Today you abuse three sites, tommorow you will be spammed with another three. Just install on your site quality captha and sleep well