Unfortunately, the stock one will be the only one with even a sliver of privacy preserving measures (so far). I tried Swiftkey when it first got released on iOS, and not only did it just not feel right like the stock one, it was also bought by Microsoft at that point and I hadn’t known since the last time I was on Android, they did not own it. :/
If you do find one though, let me know! I love trying out new things!
Gotta hoover up all that typing data, am I right?
😒