From Chaturbate in their OBS setup guide:
Resolution (WxH) | Video Bitrate | Audio Bitrate | FPS |
---|
853x480 | 800 - 1200 kbps | 96 kbps | 24 - 30 |
1024x576 | 1200 - 3000 kbps | 96 kbps | 24 - 30 |
1280x720 | 3000 - 5000 kbps | 96 kbps | 24 - 30 |
1920x1080 | 5000 - 8000 kbps | 128 kbps | 24 - 30 |
2560x1440 | 8000 - 12000 kbps | 192 kbps | 24 - 30 |
3840x2160 | 12000 - 20000 kbps | 192 kbps | 24 - 30 |
Those are real world averages from the largest speed testing site (not based on advertised upload speeds by providers), so I'm not sure what you mean by that's not what the average person has? I would think that's exactly what those numbers mean as it's all based on real usage. Either way, it's still a hefty margin over the required bandwidth for 4k. Then factoring in location, it would seem the majority of models have more than enough bandwidth for 4k. Certainly seems to be true for north america and europe. Some South America models may struggle with 4k, but even there, they should be ok for the most part (Brazil - 40Mbps, Colombia - 22Mbps, Venezuala - SOL).