From my own experience, a significant minority of my daily writing is sent to an LLM, which is very forgiving of typos. I would not be surprised if people are getting sloppier.
I have a theory that every typo you make distracts the LLM from whatever you are trying to get it to do, so I avoid typos as much as possible. I have no evidence that this is true though.
in my case it very much is. im now deliberately leaving slightly off from correct writing, or exaggerated slightly. as a sort of organic behavioral kintsugi