Well, it has a problem with my use of the Oxford comma, for one. Because a huge amount of the corpus is American English, and mine ain't. So it fails on grammar repeatedly.
And if you introduce any words of your own, it will sometimes randomly correct them to something else, and randomly correct other words to the made up ones. And it can't always tell when it's made such a change. And sometimes it does that even if you're just mixing existing languages like French or English. So you can make it useless for spellcheck by touching more than one language.
I do keep trying, despite the fact my stuff has been stolen and is in the training data, because of all the proselytising, but right now... No AI is useful for my writing. Not even just for grammar and spelling.
