Few people who weren't around in 2022 know the ENS lore. There was a time when everyone was crazy about ENS domains. 3-digit domains (called the "999 Club") sold for 20 ETH+. 4-digit domains ("10k Club") were selling for 2 ETH+. Then it got crazy, people were buying 5-digit domains for hundreds of dollars. They invented different kinds of numbers, added letters to them and traded emoji domains. Bull case being that everyone would want one of these for their onchain identity. That was the peak and a few months later it was over. A bubble within a bubble. The problem then was that many short ENS are expensive to renew, so many simply let their once-expensive domains expire. Still, the concept behind ENS (you can basically set a domain to your wallet addy, so instead of sending funds to 0xd8F... you can send to wale.eth) is still very relevant imo. Not sure if digits will ever make a comeback tho