But at least it was there.
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"When we work on making our devices accessible by the blind, I don’t consider the bloody ROI (...) The company does a lot of things for reasons besides profit motive. We want to leave the world better than we found it."
https://en.wikipedia.org/wiki/Microsoft_Active_Accessibility
It may well be that Apple is special, but in general, large software companies are motivated to care about accessibility primarily by the prospect of lucrative government contracts, for which there are usually mandated (by law) accessibility requirements. The problem for smaller companies is that accessibility doesn't scale down well - you need a lot of upfront investment (education, processes, testing etc) to get anywhere at all at first, but then all that remains useful for many more projects to come.
https://github.com/nvaccess/nvda/issues/5186#issuecomment-20...
https://bugzilla.mozilla.org/show_bug.cgi?id=381888
https://github.com/nvaccess/nvda/pull/9933
I read somewhere that screen readers look for a flashing vertical line, to detect the caret position in systems that don't expose it via the OS's APIs. I can't find a reference for that right now, though.
I'd argue that accessibility helps everyone, and is thus a positive to ROI. You know those low contrast text/background sites everyone here complains about? Yep, those are not accessible, and probably end up with less readers as a result.