FYI Inoreader does some deduplication by default. As you scroll you see a message like 'Filtered one similar article'. I haven't noticed any duplicates. That doesn't help when everyone's talking about the same thing, of course.
Does Halik upload any data from IntelliJ to halik.io or does it keep everything local? In the video, I see halik.io being used, but in the background screenshot image on the site, localhost is used.
It keeps the session local. It will upload to halik.io when you tell it to. There's a share option in the top right corner. Once shared, your session can be accessed by anyone.
I will make sure to clarify that better going onwards.