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You'd be surprised if the largest content delivery platform in the world cares about being accessible to the broadest range of users?

https://code.fb.com/ios/under-the-hood-building-accessibilit...

Why would you be surprised? They put in effort for their iOS apps to work properly (and the alt-text tags are used for Instagram in "blind mode" for example).

If you're a company that wants personal data from everyone, you want personal data from everyone.

It's a legal requirement in some parts of the world. Oh, and it means a bigger potential userbase for them. Plus it's just generally an all-round considerate thing to do.