I would describe what he is offering as similar to
GunBot, who has many vouches from reputable forum members, the main difference being that CryptoSparks has settings 'pre-filled' for his customers.
The interesting questions are..
1) If you have a really profitable trading bot (i.e. any trading bot with good strategies which generate profit in the long term), why would you share it ? Why not simply put all the money you have into it and profit yourself. That would be a money-making machine.
Sharing it with others just decreases your profit.
There are many people who create trading bots for their employer. Hedge funds and HFT firms need bots to trade, and I would assume their principals are not the only ones creating their trading bots (the HFT firms, and hedge funds hire people to create their bots).
He is selling his bot for 20% of the profits. If he can get people to cumulatively use a 'bankroll' 501% of what he can afford to risk in a bankroll, he will have higher profits than if he was using his own money.
I also am not sure that he is claiming it is 'guaranteed' his bot will produce positive returns. In a heavily regulated world, he would give a disclaimer that previous performance does not guarantee future results, but the crypto economy is still the wild west with virtually no regulation.
2) How can you claim that more people applying the same strategy will result in more profit for everyone ? There is no logical explanation for that.
This was one of the reasons he mentioned why he shares his bot. More people applying his strategy -> everyone's profit increases.
I am not sure I agree with this conclusion. He may argue that buying during a sharp, sudden decline may slow or reverse the decline and create bounces off lows we often see in trading action. See bitcoin going from ~7800 to ~8400 in well under an hour today. If he did make this argument, I am not sure I would agree with his logic without first studying the specifics.
1) He claimed his bot returned 480% in 20 months, it turns out these were just pro forma backtests, ie: NOT LIVE RESULTS (presenting a backtest as real trading performance would lead to the revoking of your license as a CTA or asset manager in many jurisdictions, including the United States, where legally you can't even publish live results unless they are audited by a certified 3rd party...)
Do you have a link to this? If this is true, and there are no extenuating circumstances, my opinion on him would change.
how will CS profit from that if his only income comes from sharing in your profit?
Until that can be answered, everything else is just peripheral noise.
Simple.
If you profit, he'll ask for a share.
If you don't, he didn't risk anything.
It's basically equivalent to having 100% lossback on a gambling site.
This should be transparent to anyone considering using his services. You may have a good reason to think this is a raw deal for any possible investor, but any possible investor is free to negotiate terms acceptable to him or her.
I am not vouching for CryptoSparks, and he may turn out to be a scammer. My position is that him offering his bot services does not automatically make him a scammer.