Suppose each of the 7 billion people in the world has 1000 unspent addresses. On average you would need to try more than 10³⁵ addresses to find each spendable one. Suppose you can check a million addresses per second, this is going to take you more than 10²¹ years.

If everyone in the world is trying to crack this at the same time, it will still take around 10¹² years. And when someone finally cracks it, after paying the electricity bill for 10¹² years, they might be disappointed to find that the key unlocks just 0.05 BTC from the Bitcoin Faucet. Even if it's ten million bitcoins, it's not going to pay the electricity bill for 7 billion computers running for a trillion years.