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The vast majority of websites that disable it, they're actually doing it to provide additional functionality which would be lost otherwise. Seems like using a sledgehammer to snap a button.

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I have no clue what websites you are visiting, but the ones I have used typically either do it to disable/customize copy/paste or use it to track your actions. They often make too many assumptions about the browser in general.

Left button draw, Right button erase

Left button rotate, Right button pan

Left button gun, Right button grenade.

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