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This is an interesting subject indeed. Even though both of them are in the "try to grab as big portion of internet traffic as possible" business I wouldn't compare them that easily.

Cloudflare is actually rather good in doing what they do (DDoS side of things). They rarely break normal internet use, the only time when that happens is when a site is put into the "I'm under attack" mode that forces browser to do javascript proof. They do get huge amounts of traffic information though, but that is pretty much required to their core business (DDoS prevention, not the tinfoil kind)

Google/ReCaptcha is another thing. I have hard time understanding any reason to put captcha on any site that a normal incremental delay between login tries & ban sources that keep doing that for too long wouldn't already prevent. They're getting traffic data and ML training data and neither one is required for the thing captcha is trying to solve. Sites are just feeding their business and captcha is actually making the internet worse place for humans.

(Captcha requirement for things like posting on a discussion could be handled by simple spam/bot detection, captcha is just overkill)




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