Kind of funny how we carry these different meanings to mostly meaningless things.
Gah.. it's all embarrassing to look back on for other reasons...
https://github.com/thinkitdata/GOBBLES/blob/master/advisorie...
Specifically about this style though, I feel it fits right into the blog series about "domestic cozy"[1]. It aims to be exactly that, imply super casual/low effort tone, make it feel a bit more personal, and simultaneously about ignoring social traditions that feel redundant to them. Like all trends, it takes effort to follow, and part of this is encouraging friends to turn off auto-capitalization on your phone.
So I would say it's a bit more than just trying to make something hard to read, and focusing on that bit might make you miss the rest of their storytelling process!
The second form is different cases, “he/him”. I have theory that people started using that because they didn’t want to put just “he”. They were following the multiple case form and it stuck. People aren’t really specifying cases because nobody uses different cases and nobody puts cases in the multiple pronouns form.