Even give years ago, Google had a keyboard that skimmed your emails and texts to start a bank of words you use to supplement it’s dictionary for autocorrect. Like if you are a chemist and send an email that includes the word “tetrahydrafuran” every couple month, it would be nice for your phone keyboard to just have it in the dictionary.
pacoboyd@lemm.ee 10 months ago
SwiftKey does that if you give it access to your emails.