Captcha-bros.com is a dubious website designed to deliver questionable content to its visitors and trick them into subscribing to its push notification service via clickbait schemes. Users are extremely unlikely to land on sites such as Captcha-bros.com intentionally. In the vast majority of cases, they are brought there either due to forced redirects triggered on previously visited sites or as a result of having a PUP (Potentially Unwanted Program) present on their computers.
Infosec researchers have observed that landing on Captcha-bros.com will result in the site of Gearbest being opened. This could mean that the operators of Captcha-bros.com have a deal to get paid a referral fee whenever visitors they send to the Gearbest page buy something there.
On its own page, Captcha-bros.com carries out a fake CAPTCHA scheme. It shows a picture of a robot accompanied by the following message:
'Click Allow to confirm that you are not a robot!'
This is a just fake pretense to get people to click the Allow button and give the site broad browser permissions. It will then abuse these permissions to run an intrusive advertising campaign. The delivered advertisements should be approached with caution, as they also could employ redirects to take the user to untrustworthy places.