Unsustainable. Things will probably change after enough Guyanese find out.
Like they changed in Venezuela?
Venezuela nationalized oil production in 71, it collapsed 50% within a few years, briefly rebounded, and is currently down almost 90%.
That didn't work out for Venezuela.
[1] https://en.wikipedia.org/wiki/Economy_of_Venezuela
[2] https://www.ohchr.org/en/press-releases/2024/02/venezuela-un...
That would be worse than Qatar turning into Venezuela. Venezuela was richer than Qatar - by quite a bit.
I think people fail to grasp how good things were in Venezuela before 71.