I'd have to go out of my way to type like that, on mobile or at a workstation.
though maybe they're just typing from a computer and there's no autocorrect to get in the way. even then, i have to override my own instinct
Too soon?
I actually have auto-capitalization turned off on my phone
I'm fine with it as long as everyone is typing in lowercase. But if the culture of a company or community is to type a certain way, there's some level of disrespect (or rebellion) by doing the opposite.
And all of these contribute to it being a power move.
"case doesn't actually matter, i'm not gonna waste my time hitting shift"
I also write my emails with proper capitalization too, for similar reasons.