alt Hacker NewsEnglish is not my first language, but when I started using Firefox with the built-in spell correction, I firmly believe my ability to spell words went drastically up. My grammar is stiff iffy, like I'm pretty sure I do comma splices everywhere, but at least most people can understand what I say now compared to when I was 13 and on the internet.
If there was a "gramma nazi" teenie tiny LLM with a total focus on English grammar only, and you baked that into every browser, I feel like my grammar would improve slightly. Word does it to an extent, but I don't use Word nearly enough for it to be meaningful. Firefox text spell checking was on 98% of the things I used online.
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I'm not going to say with 100% confidence that spellcheck never teaches anyone anything, but you have to beware of basic post hoc ergo propter hoc here. Virtually everyone's spelling improves between age 13 and adulthood.
Some play this everyday, as vocabulary will improve in time =3
did you mean "grammar nazi"? /s
A ton of "incorrect" comma usage isn't even (historically) wrong, actually, it's just currently unfashionable.
There was a reaction in the last century against poor writers with poor taste over-using punctuation and writing ugly, long sentences. The result was stern advice to students to eliminate punctuation and cut sentences up into tiny bits. These same students came out of this process believing this was correct writing, not a straight-jacket put on them to keep them from hurting themselves. They unthinkingly cite Hemingway and borrow his clout, I suppose judging almost all writing before Hemingway and most after him, up until the 80s or 90s, as "bad" even when it's the work of masters. They blame the author when their stunted literacy (learning to write can hardly be separated from learning to read, at least at the more-advanced end of "to read") leaves them, as adults, struggling with texts once meant for children.