Related: Writing "/etc/hosts" breaks the Substack editor (642 points, 8 months ago, 361 comments) https://news.ycombinator.com/item?id=43793526

This pattern shows up a lot once content filtering becomes part of the delivery path instead of a pre-check. Failures feel “network-y” but are really policy decisions leaking into transport. In systems we’ve worked on, the hardest part wasn’t blocking content, it was making the failure mode explicit so retries and debugging didn’t spiral.