There's nothing in the POVs to confirm that G did or did not cheat. It's open to personal interpretation and theorization at this point. I read all of them and I'm personally convinced that they DID.

I also don't know where you got that G wants MC to replace them?? That makes no sense to me. Fame makes G miserable but they also are attached to it for various reasons.
I love Infamous lol I think all of the characters are so complex and interesting, I love reading their POVs and trying to figure out their goals, their secrets, why they're acting the way they're acting. It's like a fun little puzzle. Some of those people are ****ing infuriating (Seven....Avina..... I'm looking at you) and even then, they're characters I love to hate.
I think where people get really frustrated with Amy is that they want answers and conclusions about every character and forget that this is a WIP where you're not supposed to know everything yet. On Tumblr she mostly gives non-answers, says cryptic stuff and makes jokes but that's because unlike the authors who reveal everything about the ROs before even bothering to write it in the game, she wants us to find out while actually playing. Plus, she knows her characters are divisive and embraces all sorts of opposing opinions on them, which may seem contradictory but I see it as her knowing her place as a writer (which is to give readers breathing room, not tell them what to think all the time).
I think there are def valid criticisms of Infamous — That the game is too harsh on MC, that some parts only make sense if MC is a pushover. I still find it enjoyable despite all that tho