Only those that have been sailing close to the wind and exposing their clients to unpredictable consequence and risks have needed to make any signifficant changes.
There are many practices that have been outside the spirit of Search Engine Optimisation that have been successful, but were clearly vulnerable to Algo changes. These frequent Algo Tweaks or major changes, have in the past caught out sites employing questionable methods. What do the SEOs do, rework the lot FOC, refund their fees with appologies or just dessert their innocent but suffering ex-clients.
The best thing to do is read the various Search Engine Guidance for Webmasters and interpret their intentions. Many read these guidelines and try to find a way through them. That is a recipe for a downstream dissaster. Complying with the intentions and spirit of the SEs guidelines will not only work better, but ensure longevity.
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