A developer bemoaned to me the threat of being legally obligated to make major chat apps interoperate because it would be too much effort and would stifle innovation, and I found that rather pathetic. If we couldn't figure out how to create protocols that connect these "modern" apps, especially given that they have mostly converged on the same set of basic features, it'd be a pretty strong indictment of the industry. To be clear, I hope it is mandated and if it is I'm sure it'll be achieved easily.