I clicked the link, and realized that what I don't know jack about is... clickbait.
TL;DR: Bandwidth != Latency, if you apply QoS/a wiser stack catering to some apps' need for lower latency, you can provide reasonable service to many users with limited bandwidth.
TL;DR: Bandwidth != Latency, if you apply QoS/a wiser stack catering to some apps' need for lower latency, you can provide reasonable service to many users with limited bandwidth.