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Hello Ahmed When you look at things like this, I think the first question has to be what is 'stuffing' (how many keywords vs. overall text)? Next, you have to ask is the only thing that is going on KW stuffing. The entire "competitors are doing this or that as a way to rank," is usually a poor way to look at your site or your competitors. But to answer your question, I have seen tons of sites/pages with text that I could not even understand due to KW overuse. If a lot in that vertical are doing the same thing, you may see many ranking. I have not seen Google utilize a manual penalty for KW stuffing alone. I would expect the effect to be the result of the algorithm. If it is a vertical where there are a lot of affiliates trying to simply push traffic and where it is very very competitive, you could see sites/pages with all types of incorrect (according to TOS) SEO. The effect of them moving down or off in these situations is often algorithmic and if most are doing the same, the effect is less measurable. Best