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You are right, they don't have to do it themselves, but guess who's protecting the booters from other booters?
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Primarily specialist bulletproof ddos protection services like ddos-guard.ru, not "Cloudflare" as is the popular meme among clueless commenters.
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Most modern booters are not maintaining public websites that could be the object of DDoS attacks. They're renting residential IP addresses from free VPN users.
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