this is not some small improvement that you could simply postpone to a later time to try and improve. this is a fundamental flaw in the very basics of the idea which needs to be address first before you even take the first step.

I'm not going to pretend that I understood everything about it since it's still a new thing for me but shouldn't this count as an unethical act/behavior?
^{- Unless I'm missing something here...}

Last month, op had the intention to lunch a gumbling platform and today he changed business niche to offer flash loans:

Defi  flash is a hot topic nowadays. That's true! But there is so little contribution in it. By doing simple researche, there is no active platform providing flash loans expect this one: https://aave.com/ which i didn't to understand it very well as it doesn't require any kind of registration from the home page; i also found that Tether team is willing to offer flash loans using aave platform, according to this article which doesn't provide so much details about the info.
Maybe you need to spend more time studing this new business before asking feedbacks from the community as you stated in the title.