From: https://anti-captcha.com/

"The most accurate, cheapest and fastest service, with an amazing customer area and support. Solve Recaptcha V2, Recaptcha V3, hCaptcha, image captchas, and many more with our top-quality trained workforce. We can also solve custom captchas on any web page by programming our workers' browsers with our proprietary technology. Our robust API supports unlimited parallel processing threads, ensuring seamless integration into your application."

Anti-Captcha doesn't provide any project code for C++ and I wanted to post an example of how easily you can utilize the api using libcurl and json. There are many other ways of going about it, but I found this solution pretty straight forward. I only needed this function to solve basic math, letter, and symbol based captchas but you should be able easily convert to their other services. Source: https://github.com/anti-captcha