There's very little point in doing that, killing NPCs in open isn't tricky, it also doesn't require risking a massive investment. However there may well be bounty hunters switching to solo to hunt in relative peace, still feels a bit cheaty though doesn't it? I think he hit the nail on the head with this (clearly getting benefits of open, with explicit avoidance of open risks)
It doesn't matter what you're doing in solo, if you go there to make money then come back to open once you have a better ship then you're taking an unfair advantage of the game mechanics. I'm not telling anyone how to play, just saying, it is unfair, it does give you an advantage.
So what if it does, although quite what this advantage is, as the statistical likelihood of me encountering them in a huge Galaxy split into instances filled by geography and ping criteria is probably zero, I don't know?
And should lightning strike it would only count if we were fighting.
Basically what this hypothetical person affects me as much as if he were playing solitaire.
Not that I'd care in the slightest if this wasn't true given that I didn't buy the game for and was paying him to play.
It's simply none of mine or your business and it is palpably absurd to say playing the game as intended is in any way, shape or form cheating.
And just for the record, life isn't 'fair' and even if it was it wouldn't conform to your or my definition so don't use that as a basis. People are playing as they want and that's fine.