I came across everyday topic on Techlore Discussions about free and open source keyboards for Android and discovered this little gem. It is FlorisBoard, a virtual keyboard for Android which respects privacy of the user. I can sigh with relief and finish my search for that singular keyboard for typing stuff on the go.
Multilanguage support: detailed layout options, popular presets
Swift and glide typing experience
Customizable gestures: switch language by fast swiping the keyboard itself left and right, change case by swiping up, the infamous cursor swipe on space bar
Emojis
Clipboard
Smartbar: quick actions and clipboard cursor tools
Exactly because the thing is FOSS, that becomes possible for more people with enough qualifications to resume it. In proprietary case, only very limited circle gets to touch the source code. We're probably witnessing a curse with virtual keyboards in FOSS, like some niche kinds of software...
FlorisBoard kinda died off for a year as patrickgold tried to implement statistical NLP suggestions. Thankfully, quite recently he opened up developments for contributors and people looking to help with the project on a long-term basis.