Is this conjecture true or false?

Any computing system that goes from mostly closed and permissioned to a mostly open and permissionless system will see its compute workload go from 1% security assurance to 99% security assurance and therefore need to 100x the size for the same available functional bandwidth.

Or 10-90 to 90-10 or similarly dramatic phase change.

Delver at contraptions.venkateshrao.com, running summerofprotocols.com, host of /gloom ☀️

Directionally right, the numbers seem overblown. IMO you could safely approximate that by human transaction costs. Not quite zero but low intrafirm. 50% or so (for legal costs; startup budget numbers flew by couple of days ago) interfirm.