destro "even if it was promotional, which it is not
what does it matter "

I think what matters is that there is a world of difference between a genuine recommendation and someone just pushing their wares, disguising it as a genuine recommendation.

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@NYCguy2020 "People have been using them for decades with no ill effects to report."

Thats not strictly true. There are increasing numbers of reports about hair dyes that darken the hair kicking off allergic reactions that have killed people. It gets reported quite a lot here in the UK where the initial link was first discovered.

http://jezebel.com/5861993/woman-near-de...e-hair-dye

But these are allergic reactions and not people contracting cancer from any of the chemicals destro has identified.
Dying hair darker is actually not that harmful to the hair as destro implies. Its lightening the hair that causes the most damage to the hair itself. Conversely, no one has died through lightening their hair!