Do unto others what you would do unto yourself and all that.
On top of that, a lot of people want interoperability, they just don't know how to express it in terms that the regular highly technical divorced from reality crowd on HN understands.
An anecdote: My mom has used Apple's Books it since it first came out. Apple keeps redesigning the app, and making it worse and more cumbersome to use. Even if there is an app that better suits my mom, I can't recommend it to her because Apple in its infinite wisdom does not let you change the default epub reader on iOS/iPadOS.
And it's just on anecdote out of hundreds. There won't be a single person who wants all of the interoperability. There will be multiple people with multiple different requirements for interoperability. From epub readers to navigation apps to Pebble watches (https://ericmigi.com/blog/apple-restricts-pebble-from-being-...).
Too bad they can't express their wishes in terms of "we want interoperability", and instead express them in terms of "why the hell Apple redesigned Books again" and "why can't Pebble show notifications". Then their wishes don't count, apparently.
> We're not talking about regulation improving human lives in general. We're talking about regulation that will stick it to foreign companies we think are too big
How did "Let's make platforms more open to increase competition and the umber of things people can do on those platforms" become "it's bad, and only exists to stick it to big US companies" is beyond my understanding (and defies all logic, if we're honest).
Sure, let's just have supranational companies create walled gardens with arbitrary rules. Nothing bad has ever come out of that.