&gt; The step from walled gardens to demanding that the the gatekeeper keeps out certain crypto apps is small.<p>The step from walled gardens to demanding that the the gatekeeper keeps out certain crypto apps is what causes the walls to fall.<p>If you can&#x27;t get secure messaging on an iPhone but you can get it on Android or Ubuntu phone and many people start buying competing hardware because of it, Apple would sooner give up the walled garden than lose that much business.<p>And you can&#x27;t draw any kind of meaningful distinction between a phone and a 7&quot; touchscreen laptop, so the only way this would actually work is to <i>ban PCs</i>.<p>Javascript is Turing-complete. Microsoft Office is Turing-complete. So you would have to stop people from running Javascript or Office or shell scripts or Minecraft or graphing calculators.<p>And you would <i>obviously</i> have to ban anything that resembles a REPL, which might create some difficulties for software development or anyone trying to learn it.<p>It&#x27;s not possible for the enemies of general purpose computing to win the war. What is possible is that they be allowed to make the attempt and end up killing lots of innocent people, both figuratively and literally.