Suchmoon, I am using his Arakne bot since 2 september and used his swing bot before that. The risk is he wash trades and liquidates all your money yes. However this is the risk u must take to trust him. I have trusted him with a relatively small amount and I see his algo bot create good returns already. Like I understand you can be skeptical but all this PONZI calls and such by other users is outright ridicolous. OP is not a scammer since he never took my money or did stupid trading to liquidate my positions or had any bad intentions with any trade.
Bitmex has option to disable withdrawing for an API key. So I am still the owner of my account. He just has trading rights. It is very easy to understand, but I guess some are lazy to read the full context.
There are plenty of bots out there using API keys. The risks are well known. The OP is the first shithead I've seen to be claiming that the API key acts as a private key and that people can lend to his service "risk free". Promising consistently high returns is just icing on the cake. If you want to believe that tripe based on the few trades you made with small amounts - go ahead. Most people tend to be more cautious about trusting liars.