The US and Euro markets are separately run by individual marketing companies essentially controlled by Epson/Seiko Japan. However, the US market is a major driving force. So, if Epson US doesn't want to do something, it has the independence to reject a product or software-just as Epson UK or Europe could do. Reading anything sinister in something being offered in one market and not another is really tea leaf reading that prolly bares no relationship to reality.
That said, Colorbase requires the user already have a spectrophotometer such as an Eye-One or X-Rite PULSE. I believe it also requires a UV cutoff filter. But, if you have the spectro, odds are you already have the tools for making custom profiles anyway-which would be a better solution than using software to "edit" the printer's firmware-which is what you must do.
Colorbase is a solution for commercial printers, not regular consumers. Get a custom profile for the 2400/4800/7800/9800 printers and you'll be far better off. And please, no more "conspiracy theories"...the black helicopters will be coming...