When the game is dead aka End of Service. I don't mind FGO no longer be my primary game in my phone, but to be truly leave this game is when the game literally end.

If it starts collaborating with random games or media from who knows where and start popping out characters which makes no sense appearing in the series. (눈_눈)

I also used to play only for the sake of gil, but greed...

Temporarily? Bad business practices. See: Long Jeanne/9th Anni debacles.

Permanently? I mean 9th anni did come close, but I guess it was somewhat fixed after the fact.

Otherwise, definitely losing the account. I don't think I would have it in me to build it all back up again.

End of Service is the most likely, but I'd also hate if it started pushing subscriptions or pvp multiplayer.

It would be funny if the devs call the last part of the current story "EOS" as a joke.

Any male historical figure that I respect somewhat genderbent, especially if that male historical figure become moe-moe. I just hope it will not happen.