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ICO's are gone. Most blockchains do not work because the sandbox does not work
Sandboxes are based upon testing. Testing can find one error. Maybe more, say 10. But how you are sure you found ALL errors? Old fashioned sandbox testing does not solve that problem.
The impact of using the wrong method is severe because
The blockchain is:
all about compliance & certification. Governments insist on finding all errors because it could be fraud as well.
Write-only, hence how to get rid of errors once made?
How to test in a write only environment?
Distributed, hence hard to remove distributed errors.
Distributed and you cannot make an easy copy for testing as you are used too.
Testing requires many programmers that are just not available.
Programmers are not well educated and got used to testing instead of formal verification.
Testing or work done manual in a digital environment causes "digitization asymmetry". In this case It's hard to keep up with the need...