You can add the intermediate CA to your block list, presumably the distros will do this

All the numbers were under 256. Surely they did.

This wasnt malice its was laziness.

They literally were too lazy to type more than just a single '4'.

Literally the tutorial they used

I think this might be proprietary source code, did you get permission to share this?..

Another place to search for private key candidates would be the outputs of various common PRNGs when they have been seeded with a timestamp (for all timestamps in, say, the past 20 years).

These would look like nice random values (unlike the ones that were recently compromised), but they would be trivial to generate by anyone who knows the initial inputs (PRNG algorithm, seed, maybe starting byte position, etc.).