An Ethereum soft fork, to prevent DAO money being taken, would permit a DoS: https://hackingdistributed.com/2016/06/28/ethereum-soft-fork-dos-vector/ (the system complexity here is huge)
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Ooh, I've just discovered that you can enable actions on GitHub pull requests by default! This is the actions settings page.
My understanding is that GitHub introduced these limits to prevent people trying to run cryptominers on GitHub actions. Sounds like GitHub has largely fixed it.
OpenSSH will send packets at 20ms intervals to prevent network timings revealing what you're typing: https://undeadly.org/cgi?action=article;sid=20230829051257
Really elegant solution!
Including poetry in your database protocol, to prevent competing implementations!