I don't mind the fact that he is generous, even overly generous because, hes a space office from a scientifically advanced society. Being a greedy self centered asshole would not be fitting for a space officer, and he doesn't need to care about money either way, because its not important to him. What is going to do with money? Buy a house? Get some old tech clothes? He doesn't really need it either.
And hes not the typical shitty chinese isekai/xian xia MC who is all about killing people and stealing their stuff. He's not a bandit, and he shouldn't be.
In the future they would probably psychologically test out people like that in the military especially since they have nano machines, and greedy selfish people shouldn't be soldiers or have any sort of power. EVER.