If so good why are you selling it as a service ?
The models are not HFT. Swing-trading the most liquid instrument in the world (ES futures) has extremely high strategy capacity, well into the billions or perhaps 10s of billions, so selling signals does not (currently) in any way negatively impact my own returns.
The alternative would be to start a hedge fund, but that's an expensive and highly regulated endeavor that appeals to a different audience.
could this have any legal risks, e.g. your clients will sue you for manipulations and causing losses to them? Is this a valid business at all from SEC standpoint?
All that said, subscribers have generally been happy with Grizzly Bulls' service as evidenced by our low churn rate, especially for the higher tiers.