There is no negative impact to a website that I have noticed from Referer Spammer bots besides just skewing Metrics so you do not need to add the BPS Bonus Custom code to block those bot requests from hitting your site(s). I see a growing trend towards the Referer bots sending fake tracking calls directly to your Google Analytics Tracking ID so at some point the BPS Bonus Custom code may not be useful at all and only filtering out Referer spam Metrics in GA or other Metrics apps would be the only way to get rid of that junk traffic.
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