why ahrefs doesn't count tumbrl links as BL?

Because there's a difference between running your imacros bot from your basement and managing the crawler of an internationally recognized company such as Ahrefs that visits billions of pages.

Of course, but what would happen if all SEO tools did that? Not just Ahrefs, but SeoMoz, Majestic and the rest? People would have no other option than using them anyway.
 
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