On a related note, does anyone have recommendations for a Gboard alternative? I've disabled all the "pipe everything I type directly to HQ for analysis" things in Gboard but I'd prefer a non-Google alternative.
AnySoftKeyboard is completely open-source and is distributed through both the Play Store and F-Droid. It comes with many different layouts and there are a few language packs available. They recently added experimental support for swipe typing if that's a concern.
I've been using and loving MessageEase [1] for several years now. There's a learning curve, but as much typing as I end up doing on my phone, the investment was well worth it. It's also hugely customizeable and makes coding much easier on a phone--not that I make a habit of that.
I've been using Simple Keyboard, which seems to be what it says on the tin. Not a lot of features, doesn't make my phone sad. (In today's android, 2GB is not enough memory, saving some ram on the keyboard makes my launcher less likely to swap out when it's in the background; I wish I was overreacting)