I feel like hosting your own Obsidian vault is still the way to go.

Isn’t this similar to the tech used in fiber optics cables? Or am I way off

Same here, works fine on PC. I even get the notification on PC first sometimes.

Been using Signal for a very long time now, with my SO, parents, brother and a few friends. But it’s inevitable to also use WhatsApp side by side. Selling/Buying on the local marketplace? WhatsApp. Workplace colleagues? WhatsApp. That group of buddies where only 1 or 2 converted to Signal? WhatsApp.