"such as word processing and browsers"
You mean like browsers in iOS and Chromebooks? Here again, MS came last, others paved the way to full lock-in.
You may also want to read: https://www.theregister.co.uk/2013/01/03/microsoft_claims_google_undermining_winphone/
Office is in the Play Store only because Google knows without Android would have not a chance in the business market.