Even if your SOCKS5 proxy supports UDP, most anti-detect browsers (in particular, those based on Chromium) are unable to pass WebRTCtraffic through the proxy. The reason is the browser engine’s technical limitations.
Today, captcha systems are already introducing enhanced checks for the presence of WebRTC, a good example is Discord, they connected "Hcaptcha-enterprise", where the check for the presence of an enabled WebRTC on the user’s side.
