You absolutely can make money with bots in cryptocurrency - there are times when different exchanges have $100 differences in the price of bitcoin. During times of volatility you can have bots making money off arbitrage.
At least circa whenever it was that BTC broke $100, the state of exchanges' APIs was such that arbitrage wasn't practical. I remember reading about it on an old bitcointalk.org thread when the Butter-Bot developers were soliciting feedback regarding what direction their paid customer base wanted them to go.
The only working arbitrage software I ever saw was this short-lived one with a circular UI (IIRC), & it wasn't fully automated.
I'd be interested to learn the current state of affairs on the subject.
It's not really pure arbitrage when the prices are so volatile and every transaction takes ~30 minutes to confirm. I'd say he's going to have better luck with smaller crypto trading pairs.
The only working arbitrage software I ever saw was this short-lived one with a circular UI (IIRC), & it wasn't fully automated.
I'd be interested to learn the current state of affairs on the subject.