How to Evaluate Link-Building Agencies Without Getting Fooled by Over-Optimized Anchor Text
https://star-wiki.win/index.php/When_Marketing_Leaders_Get_Burned_by_Link_Building_Vendors:_Sam%27s_Story
If you run marketing for a brand or own an agency, this is the frank warning you need: industry data shows teams that have been burned by bad link-building vendors fail 73% of the time when evaluating new agencies because they miss over-optimized