I did that for a year and then ended up a class short of graduating because of a scheduling mistake. Since staying a grad assistant wasn't an option, I ultimately dropped out and started working instead. Getting the GA job required me to take the GRE (I scored 170 on the math part, 165 on the verbal and 90 something percentile for both with only minimal studying for the test) and be interviewed about some undergrad CS concepts.

If you're able to do grad school in CS and you've already got permanent legal status in the US, it doesn't really make financial sense even if you're a GA or TA. You can make much more just getting a job. That said, I don't regret doing it because I probably enjoyed that year more than any of my undergrad years (this was pre-pandemic) and I didn't go into any additional debt to do it!