Remaining erstwhile "Communist countries" (as stated above, I do not believe China qualifies as they abandoned the economic side of Communism beginning in 1979):
Cuba
North Korea
Nepal
Total GDP: $100.6 billion ($5.8 trillion if you insist on adding China)
Remaining capitalist countries:
Most of the rest of the world, although we'll just consider the EU, USA and Japan for sake of argument:
Total GDP: $35.9 trillion
I think we can soundly say that capitalism won, and also safely say that Nepalese Maoists running the democratic bureaucracy of one the poorest countries in the world (172nd out of 194 on a GDP per-capita scale) in a landlocked nook of the Himalayas does not constitute a threat to....well, anyone. Probably not even to the Nepalese themselves.
As to their 'terrorist' status, it's shared with a number of other groups which hardly constitute a significant threat these days, such as the PKK, the Continuity IRA, the Real IRA, the Liberation Tigers of Tamil Eelam, Shining Path, and Aum Shinrikyo.
Let's think about that for a second. The Tamil Tigers are destroyed. The Shining Path mostly collapsed after 1992, and has been on a downward spiral ever since. Aum Shinrikyo had *one* year in which it was a bonafide terrorist organization (1995). It has done absolute zilch since then.
Being on the State Dept list isn't much of a threat indicator. Used to be, it automatically dropped groups every two years unless there was a good reason to keep a group on there. Thanks to the War on Turr, they changed to it "you can petition to be taken off after four years, otherwise a group stays on there forever".