I don't think Bitfinex is a scam, it's been a trusted exchange in the crypto market and using bots is a normal tool in making a trade, it is the prerogative of the investors to fully understand on how to utilize the tool.
I also think so, bitfinex is a trusted exchange, and even if there is news saying that bitfinex is a scam, maybe it is untrue news, and someone who says that bitfinex is a scam, they must have really strong evidence.
Though it has an history of being hacked there are still people who thinks that was an inside job.
It is one of the biggest exchange after that hack and until now. I don't think that they will do something again like just to ruin their reputation.