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Correct, it's listed on https://webmasters.googleblog.com/2009/11/hard-facts-about-comment-spam.html for example (google's own blog). You really need to avoid doing that practice, and second, most of the blogs now only offer a "Nofollow" based website link (that is if they ever show a website adres within the template). If you want to get links, a good start is to signup your website to category's / business listings that are relevant to your website or service you are providing. It might take a month or so to be found, caught up and see some changes going on. Buying links is a no go really, as that is to bypass a natural linkbuilding.