This one kinda makes some sense. Screens and text are often small enough that properly punctuated sentences can almost feel cramped. Adding visual space helps emphasize pauses and full stops. I use hyphens often in Discord when chatting, instead of periods or commas, since comments and convos can shift pretty quickly.
A grammar Nazi takes time out of their day to give someone crap about a comma splice or argue about whether or not it's appropriate to capitalize the first word after a colon. OPs like this are not "Grammar Nazi" fodder. It's just language anarchy normalized by terminally online brainrot.
Maybe they're not a native speaker? German for instance capitalizes all nouns. You'll often find weird capitalizations in my (mobile) writing when my phone didn't correctly guess what I wanted to type. At least some words in the OPs text are German nouns (e.g. See, All), while others aren't.