No, that's a feature. Google voice to text will send everything to google servers.

HeliBoard is soooo good. Seconded. A lot of FOSS keyboards out there need.... A little more polish ^^;

They aren't true foss, but 'source available'. I don't remember why exactly (probably for licensing or something) and the typical user won't know what that means nor care, but it is something to be aware of.

I like and use Grayjay, but the keyboard was not up to my standards, personally. Can't find any foss/adjacent keyboards to come close to SwiftKey at all. I've been using it since release like 16+ years ago (?) or something, and every time I try something else, it's just bad for a bunch of reasons.

It has improved over the years from when I first installed it. I just really appreciate the AMOLED theme and simple UI. I never found a reason to find a replacement.