What value is an open standard if it can only be useful if you use an implementation from a large corporation. It’s a basic fact that email is only useful if yo

What value is an open standard if it can only be useful if you use an implementation from a large corporation. It’s a basic fact that email is only useful if your intended recipient can receive your message. If corporate gatekeepers are restricting valid usage outside of their walls, then it ceases to be an open standard. It’s like the difference between source available and open source.