Last month; SSH was nearly backdoored with nobody noticing. SSH, open source software, and one of the most important pieces of software ever written for security, was extremely close to failure.
If that had happened, an attacker very well could have ended the entire internet as we know it. Imagine if that hacker merely used that backdoor to get into Windows Update servers, Google Play servers, or sent out a CrowdStrike update.
We were within weeks of nothing being safe.