Just found out about this trading bot 3commas, any takes or testimonies guys?
I've had friends who have recommended me to use this service.
There is absolutely no guarantee that using a bot like 3commas will bring you any more profit if you just trade yourself and speculate on fundamentals. They don't make promises as to profit margins, nor do they seem to ask you to invest directly into their operations but rather use API keys to connect to your account, which is better than obvious ponzi schemes, at least.
But again, profitability is in question (given that you have to pay for a subscription) and there are previous accusations in terms of them skimming funds off trades. There are no reliable long term tests conducted either. I would personally not use the service at all, given the fact that subscription fees can eat deeply into any profits you make if you're a small time trader, and the risk of them having access to your exchange account API info.