The way I understand it, you control the private key and the lenders are given access to the platform via API keys. That means you can also control the funds provided by lenders. You, as the platform owner, is also capable of doing anything like changing the access of lenders to their funds.
Not at all, but i like the way you approached the critic, with at least a doubt assumption. I can see you haven't reached the legendary status yet.

If you're talking about our service, is very easy. There's no private key.

People create and manage their own bitmex account, while giving us a ORDER ONLY API KEY to link the bot. We have no direct access to the account,email, password,privatekey. NOTHING.. Yet somehow, people say we run a ponzi while we actually never touch the funds untill the costumer voluntary pays the commission.
If you are talking about the proposition i made to lenders providers on this forum, that's different since we are actually borrowing money with interest. In that case a new bitmex account gets created and email+password+email account + api key gets delivered to the lender so it can keep full control on the funds even though the funds are actually "ours" and the lender could run away with the loan+ profits generated.
This wasn't clear to me when I read your other thread. I don't know if what you claim (ROI) is real and that is for other readers to decide. Maybe you can improve on your presentation and transparency? I'm not sure if you were willing to provide the above info if I had not ask.