nid
I can see how "typing habits" is misleading. "Usage" habits is more accurate. Sorry.
GBoard is relatively safe to use, but you just have to be very aware of how you use it. I personally block the network access. I lose GIFs, but that was another vector for Google to build a profile.
https://www.macworld.com/article/228011/googles-gboard-doesnt-send-your-keystrokes-but-it-does-leak-chicken-and-noodles.html