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Yes, been link building for over 9 months now, mainly from article syndication with many different anchor texts.
Maybe using up to 40 different anchors spread amongst the home page and four deeper category pages.
I can put my hand on my heart and say that 9 of them are actively link building/manipulating the algorithm
All it can do is speed up the process and they may offer you some helpful advice as to what exactly it is they have become disgruntled about. This can at least put you in the right direction.
I'm with you that in some niches you have to buys links and others seem to get away with it.
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should I stop all link building work with keyword targeted anchor text