Just to be clear, Simple Keyboard does not have autocorrect, right? Also, there seems to be two "Simple Keyboard" apps on Fdroid. I installed the one with the most recent update.
I have been using Android with NoRoot Firewall. I aways use Gboard, really amazing keyboard software. The first time I let it "phone home" so it downloads whatever it needs for multiple languages. Then I block it with the NRF and it never phones home again (ET sad):
Are you using the stock keyboard? I allways install Simple Keyboard from F-Droid, Zero problems for years.