Don't know. When I'm seeing proxy recommendations or people discuss it they seem to be more out of the picture vs proxy6. Likely due to proxy6 pricing and location availability.
Proxy6 is pretty popular nowadays. Blazing isn't so much rip ^, if you want a provider that no one is using, may I suggest creating your own proxy server on some cheap vps with 1ipv4 maybe sufficient.
Because we got people getting hacked left right and center, because some of JAgex's employees are shit fucks regarding letting people get their accounts recovered by the people stealing them. To add salt to the wound they sell that GP for very low pricing and ultimately turns everything into a shit fest.
Or another theory is Jagex aren't proactive enough with real world traders and there is just too much GP up for RWT.