No no no no no. We don't want to people to join and enjoy our near 100% uptime. Also be warned that lemm.ee isn't de-federated with lemmynsfw so you'll get PORN on your all feed. The horror. Steer clear.
I look at lemmy.world all occasionally to get a sense of what I'm interested in but don't know it yet. Then I subscribe to help expand the variety for everyone. Not that lemm.ee is all that small
Virtually identical absolutely. But in my personal experience over the last few months, I see content that's in lemmy.world that's not on lemm.ee
For a while, because content was more thin, I'd run through all of active, then all of hot, then I'd look at lemmy.world just to see if there was content I hadn't seen yet
So I don't know enough about the inner workings, but on Reddit I never browsed all at all - it was 100% communities I'd subscribed to. At the moment I'm happy with Lemmy All, but if in the future when content gets too much, would I say, be able to host my own instance in my Android device and my subscriptions will just pull in the content I'm interested in? That way I am not putting load on other instances, and I can take my configuration with me without needing a cloud service?
My understanding is you can't host your own instance on an Android device, you'd need a server. You could stand up a server on Oracle Cloud, their Always Free tier is pretty generous.
The main issue is that Lemmy instances, by default, only know about their local communities and remote communities that the users of that server have deliberately subscribed to. Some smaller instances are running federation helpers which are bots that search for remote communities to fix this.
You subscribe to individual communities. So unless a user or the admin already subscribed to a community there won't be any content there from those communities.
Even after subscribing only new content (and old content that has had replies/likes) will show up.
Your subscribed will be the same. All will differ as it grabs everything everyone on that instance is subscribed to.
Ex. If you're on lemmyworld you'll see everything there by default but if you swap to instance X and nobody in x is subbed to niche.community@lemmyworld then it won't be brought to your All