this site (x.com) keeps coming up on my google search for local keywords even though they are not local. all other top ranking sites have at most 2k backlinks, and this is the ahrefs results of x.com: the steep drop is a clear implication of spam backlinks i suppose. the conclusion is mass spam backlinks also works for local seo purpose. my attempts at backlinks never came close to 200k. i guess thats why i never saw any success.