HTTP security headers - do they have an effect on SEO and affiliate links?

Hello,

my site was recently moved to WPX hosting and the programmer fixed some site speed issued, plus he added HTTP security headers to the .htaccess file.

The rating for my site is now A+ on https://ift.tt/17qiAS8

However, I checked 20+ websites (from small to super large) and every single has an F rating (or at best a D) - even super big, multi-billion dollar websites.

Why is that so? Fixing HTTP headers seems to be easy. Why nobody does it?

Also, I wonder if this has...

HTTP security headers - do they have an effect on SEO and affiliate links?

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