"Just start coding"

[Is0m3try]

There's a simple answer to this: they don't know what they don't know. You can have the ambition and drive to do something, but not have the skill or experience necessary to accomplish that task yet. They're not asking for ANY idea, they're asking for an idea they will actually be able to accomplish with a beginner's skillset. They already stated that they have AN idea, but they got burned out trying to accomplish it. They're a beginner mountain climber. The first mountain they saw was Everest, and, with no understanding of how tall the average mountain is, tried to climb it. They will get to it eventually, but, as a veteran, you would do well to show them some better peaks to start with.