it's won't be hard to get good sites
i mean u can get all domain that activated years ago related to niche u want then filter them passed on their visitors and seo ranking
but it's worthy as it looks
niche/language relevant ones with lowest possible OBL that would approve the comments,
that's the best you can get and that's hard to get with automation, irrelevant links can still do the work, but with recent updates they're not as good,
all depending on the niches & competition as well, not going to work the same with all of them,
the thing is, Google won't really know if this is a "comment" link, it will be a part of the html page content, just another content added,
the whole thing is where and in which pages can you get this links added, you won't find such links in any of the "authority" websites in most cases,
neither it will be a contextual link or placed at the top of the page content & could be a nofollow one in many cases,
but it's still a link, within the right pages/websites it will pass some of the link juice,
i've came across some websites relying totally on comment (& forum) links in different niches,
a good example would be niche specific recipes websites, where many just comment on other recipe blogs with the website/author name as the anchor,
many of them are actually doing well in terms of ranking & profit
