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Yup. At least a decade ago I used to explain how important interoperability was to legislate for, and used this as the main example of why. Networks are better for everyone when there is no lock in, and the waste of competition for eyeballs could be avoided. It’s sad that most people truly don’t understand this.
Yup. It’s why so many died, not from measles, but from other diseases in the 3-5 years after they had measles. IIRC they only really worked this out in the last 5-10 years because of the amount of data to comb through.