With a fabricated platform, I guess anyone could make a video which will seem like a real trading environment to do all buying and selling. So, I would not believe into any signal provider just because of a video proof.

Basically if I would have developed a new futures trading system, I would not waste time by inviting people to my telegram but will spend all my time to multiply my capital in all possible means. I mean why I need to prove my skills whereas the world will come to know myself by my trading performance. So, OP must be looking for subscribers to sell their signals and nothing more. All the above, a new trading may be possible to be developed but its efficiency will fade away over the time hence rushing just because of a new system does not make sense to me.