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Thankfully there's a few open source keyboards.

I've been checking out FlorisBoard, available on fdroid. Sadly, Google and Samsung keyboards are very good at swype/glide, FlorisBoard is coming along though, & I prefer to support it because the other two can't be trusted.

Both phones I was referencing were Samsung devices.

Do you know that grammarly keeps this information and doesn't toss it after it's AI looks for patterns for training?

I'm not aware of any actual AI system for NL using on-line training -- this unlabeled, after all! So "after it looks for patterns" is more "after the next training batch runs", 30 days if they're GDPR compliant.