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There is hope. The European Union's Digital Markets Act allows new messaging platforms to demand interoperability with the existing walled gardens. All it takes

• dwaite 3y ago
  You can't use regulations to change physics, and (demands or no) it is unclear what sort of interoperability is really possible. What will really happen is that there will be some subpar common denominator. An existing "walled garden" (WeChat?) would add support for this as well. But this would wind up being rather insecure, because messaging services tend to use email addresses they don't control or phone numbers they don't control as identifiers. We'd have to wait for carriers and email providers to be regulated with the burden of solving this mess (for markets they aren't in).