Account Suspension or Block by Traffic Exchange sites

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I've been using traffic exchange sites for a while, been more actively these days. However, recently my account was being suspended or blocked by two traffic exchange sites. But I don't really know what happened. I only used TEbrowser to browse multiple traffic exchange sites. This shouldn't be an issue since quite a number of people are using this as well. The two traffic exchange sites that I got blocked is easyhits4u and dragonsurf. Anyone knows possible reasons or have similar experiences?