Will the root domain name be affected if the second-level domain name is K?

Many people say that I want to open a second-level domain name to build other websites. If I build a website that is a forum, for example: bbs.xx.com, if my forum is hacked, www.xx.com will be implicated. Root domain name?

Recently, Baidu has released many new algorithms. Maybe everyone is more careful, but we must be careful in everything we do. I remember Baidu official said in answer to a question that the second-level domain name may be considered as a new domain name. But what about the facts. Through extensive data analysis, we came to the conclusion that subdomains under domain names with relatively high weight will inherit part of the weight from the root domain name (not much).

But if the second-level domain name is k or downgraded, the root domain name will not be affected, that is, the root domain name will not be implicated. But everything has a degree. If you have ten subdomains under one root domain name, and then all ten subdomains are hacked, can your root domain name still survive?

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