Is Security header optional or functional requirement?

Hi Guys I want to know that is it compulsory to install Security header or its just an optional requirement, because I have scanned lots of branded domain and I got “F” grade result, so My question is that why big sites are not using Security Header if it is too much necessary to prevent hacking attack…

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Completely optional, and generally not something Cloudflare is involved with.

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it’s mean I can also neglect for my tiny site. Thank Sir for response really helpful.

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