[darren_]

disclaimer: I work on google maps

> Several months after Apple Maps became the default, something like 2/3rds of all users switched away from Google Maps.

When Apple Maps 'became the default', what actually happened was it outright replaced the Google-powered Maps app entirely, and there was no replacement Google-written Maps app _for_ several months. People didn't 'switch away', they were switched, you could not stay on google maps if you wanted to.

Per your numbers, 1/3rd of a platform switching back (despite having to wait months and install a new app to do so) sounds like a pretty big return to me. But I don't think there's a lot we can infer about users' propensity to set search engine defaults vs propensity to install/use apps.