The easiest way to recognize that something was made with AI is by noticing when a cheap idea has a very expensive execution.
The one safe tell (for now) is the fact that LLMs have no filter on how hard they should go. Their entire fidelity spectrum is one speed: go.
Humans don't work that way. When we're not sure about the potential for success, we don't go all in. We have matches to burn, and we are afraid of burning them all for nothing. AI has a flamethrower, and there is a whole world to torch.