Let me address this, then:
- they are not smart
- they are not contracts
- they are programs written in esoteric programming languages running on world's slowest and most inefficient VM
- due to esoteric nature their own authors cannot find trivial bugs in their implementations that are exploited at scale which would make any real platform nonviable
- cannot be updated or reverted because blockchain
- have literally no use outside the virtual imaginary world of crypto
- have zero legal standing, and cannot be enforced
- in every single case would be more efficient and better served by Visual Basic running on a single Raspberry Pi from a sqlite database.