You are preaching to the converted here, but lets be honest ... Rain - the weather, and many other factors (ironic I know) will affect 5G speeds. I would hope people on 30Mb will be getting a guaranteed speed if it is being limited from a higher speed.
BTW, on the news article apparently they are saying the video streams will be limited to 480p on Rain's end. Not cool. I am sure they can not force that in a totally fool proof manner, and the question is exactly at what speed do they throttle services like Netflix, Prime, Showmax, etc to force a 480p stream.