Well technically it's not a fake account, it used to be legit. It is a failed cryptocurrency that called itself ethereum dark too (adding 'dark' to a popular coin seems to be a trend, huh?). I don't think it has anything to do with this currency, it's been three years and their whole demeanor and layout seems very different.
Why did that fail? What stops this from failing ?
What stops any coin from failing? An active dev team, future plans, original ideas, and a supportive community, I'd guess.
I don't know why ETD failed, I wasn't into crypto at all and am still pretty new to this. Seems like ETD devs just kinda gave up.