Why wouldn't the same problems occur with free scripts? Disabling all JavaScript not on some "trusted" sites that need it would solve them. (Although most of these problems can be implemented differently to not use JavaScript.)
I think free JavaScript would be better by allowing users to study how it works and modify it, so modified browsers could run their replacements instead of the scripts provided by the site or other tools could access the same data (e.g. video download scripts). (There are more benefits with useful scripts or if the user has their own site.) (I'm not a Web developer and I consider the approach of running programs From any visited Web site a mistake.)
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