As I understand it, it is just browsers enforcing it, with Safari [1] doing so first, then Chromium [2] doing the same, both doing so in 2020. [1] https://supp

As I understand it, it is just browsers enforcing it, with Safari [1] doing so first, then Chromium [2] doing the same, both doing so in 2020. [1] https://support.apple.com/en-us/102028 https://support.apple.com/en-us/102028 [2] https://chromium.googlesource.com/chromium/src/+/master/net/docs/certificate_lifetimes.md https://chromium.googlesource.com/chromium/src/+/master/net/...