Recently someone on reddit asked what could have caused a 50% drop in their Domain Authority and whether perhaps this drop in DA value was related to an abnormal amount of spam backlinks and equally belgium phone number useless comments.
As pointed out by some of those who answered first in absolute, the DA is not a value that is assigned by Google but a score that is found if you use the tool offered by MOZ. Within this same convent it is also remembered that the way in which MOZ calculates the Domain Authority is based on its own algorithm .
This already says something about SEO tools: as much as they want to try to be useful (and in many ways they are) they cannot replicate what Google does and therefore their numbers, their traffic lights, their diagrams and graphs are not necessarily a precise and faithful indication of what is happening in the SERP.
John Muller then joined the discussion.
At the beginning, however, his answer focused on one of the questions raised by those who had left their doubt on the forum, the issue related to Disallow and Disavow. Mueller first clarified that the disallow instruction cannot in any way influence any metric produced by any SEO tool. Because no tool has access to the resources indicated with disallow.
And others further clarify the issue by recalling how Domain Authority itself is actually a third-party metric that Google does not use and therefore has no impact on ranking within the SERP.
And here comes what in our opinion is the most interesting answer given, as if on purpose, again by Mueller.