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Re-captcha-version-3-21.top is one of numerous untrustworthy sites that try to trick users into subscribing to notifications from those sites. Re-captcha-version-3-21.top will tell users that they need to click allow on its notifications confirmation pop-up to prove that they are humans and not robots. If a user clicks Allow, notifications from Re-captcha-version-3-21.top will start appearing on his or her screen periodically and spamming the user with ads, links to shady sites, scammy messages, prompts to download some programs or software updates, and so on. The notifications will be showing up in the lower right hand corner of the screen on Windows, in the top right hand corner of the screen on macOS, and on the status bar on Android.