I should clarify I didn't mean every 0x guarantees it's a crypto reference. However, if their previous name had .eth at the end, and especially if there's a 'NF

I should clarify I didn't mean every 0x guarantees it's a crypto reference. However, if their previous name had .eth at the end, and especially if there's a 'NFT' in their new username somewhere, it's almost certainly a reference to crypto.