I agree that the epilogue comes across as a needlessly sad ending.
Indeed, clearly there are more "servers" around the globe, so it's a matter of proximity. She died for no god damn reason, other than: "we're running out of money, just end it already." They didn't even try (at least in the manga?) to come up with a solution.
I wonder how good the novel is? Because the manga, while really fun to read, comes across as really badly written.
Why the MC loops back wasn't properly introduced at first, and was just thrown at the reader as a none-reason. (Obviously, if the MC has no idea why, the reader shouldn't know either, but there wasn't even a smidge of a hint.)
Also, the reason why the MC and Rita even fell in love seems contrived as all hell. Sure, she's happy to meet someone who she can share that experience with, but they met for a day, and (implicitly) had sex on that same day, when from her perspective she just met him? And already fallen in love?
The rhythm of the manga felt really rushed for no reason, and overall the idea wasn't really fleshed out.