Some communities could be empty if no one from your instance is subscribed.

That’s how ActivityPub optimizes the running cost. Otherwise it would be to expensive for instances to download all the data.

Always wanted to ask, what are the countries with accessible medicine? Could anyone recommend?

They usually cut costs in unnoticeable for regular consumer way. Like include some chemistry that easy to produce and makes it tasty, but bad for health.

Similar to what most smartwatches can: measure heartbeat, show notifications and answer calls from your smartphone, flashlight (by showing white write screen), show weather, etc.

PineTime is nice, wearing it right now.