For me, the strongest evidence would be sustained revenue growth from AI services, improving free cash flow and margins, and clear signs that customer demand is keeping pace with infrastructure spending. I would also watch how quickly companies turn new data centre capacity into revenue. If earnings grow faster than capital expenditure over several quarters, that would give me more confidence that today’s AI spending can deliver attractive long-term returns. Until then, I think investors should be selective rather than assuming every AI-related company will benefit equally.