The keyword cannibalization SEO concept is Google will be confused when multiple webpages on the same site have the same title tags and won’t know which of the webpages to rank the highest.
There’s a major flaw with this SEO concept, Google’s algorithm isn’t THAT dumb.
Google relies on hundreds of ranking factors and though title tags are a major ranking factor, it’s not the ONLY ranking factor. Google would look at the title tags AND the hundreds of other factors including usage in content, usage in backlinks etc… and rank the webpages accordingly.
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