Is it true that Black Hat SEO are illegal?

Yes, Black hat SEO doesn't follow Google guidelines, thus any Black Hat followed by you can affect your site ranking. Even though this technique boost your keywords immediately, but from a long term point of view this technique should not be followed.
 
Yes black Hat SEO is an unethical SEO technique which doesn't follow Google rules and policies and may lead to penalizing of your website and even banning of it.
 
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