It’s called Title Case. There are different rules depending on which style manual you’re using. Some people just capitalise everything. Some people don’t use it at all.
The RedReader developer (QuantumBadger) said they’d like to make it a more general reader app and include support for RSS and Lemmy. It would take a while to to it though. They would have to abstract a lot of the Reddit specific code.
I hope they do it, it’s a really nice app.
You really need to watch Red Dwarf