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Neil Ferree's profile photoJohn Griffith's profile photo
'Bullet proof' suggests a permanent state. Something is not bullet proof one day and bullet ridden the next. Link building is always questionable and only as good as the next algorithm change.  Todays good link is tomorrows valueless or even 'toxic' link.  Bullet proof? Not likely.  Any manufactured link is by definition ultimately questionable.
you're right +John Griffith but you gotta admit • this post with the roster of seo gurus came with a pretty nice H1 opener