He wants to start a project that is similar to the idea for a project that one of his acquaintances has
Do we owe everything to his relative or have we wronged him in any way, or stolen his idea? Please note that I wanted to do this for a while. But I am really afraid of wronging anyone or contaminating my wealth with anything haraam.
There does not seem to be anything wrong with your setting up this project, even if the idea is similar to what your friend’s relative wanted to do, because such ideas are very common and many programmers and others think of them, so you have not impinged upon the unique rights of an inventor. If someone hears that some person is thinking about doing some project, then he does the same thing, he is not transgressing anyone’s rights.
And Allah knows best.