I've been using FUTO's keyboard for quite a while now and I really appreciate their voice input feature. It makes the process so much easier and I don't have to worry about privacy issues. This is the first time that a keyboard alternative worked out for me.
FUTO Voice Input is good. Used it for a long time. Florisboard w/Transcribo for voice-to-text is just as good, plus they're true FOSS, unlike FUTO.
I've tried other boards like that one, but they don't work out for me as much. I think that FUTO's keyboard is definitely more feature-rich and refined, even if it's not quite true FOSS. Personally, I don't necessarily need it to be total FOSS, I just want to be respected as a user. So far they have respected their users and brought open source software/source available software to a wider audience so I'm cool with them for now.