I’ve noticed that it’s been a trend for quite some time to form complete sentences while not capitalizing letters in their correct places. This just personally annoys be a bit (yeah, yeah, grammar police, I know) and I can’t figure out why people do this.
It’s literally just about not caring enough to put mental effort into it. The words are the same, so it doesn’t really matter. It’s not out of malice.
I generally try to capitalise properly (though my phone is sorting it out now), but sometimes on desktop I just don’t care, it doesn’t affect me in any way. There’s so much else to care about that it’s just not worth the mental effort.
Ideally it’s just a habit you don’t have to think about, but not everyone has developed that habit.