I'm not sure if it ever was that hard but if you follow a bunch of people the network effects will kick in eventually, you can also add relays to pull in posts

I'm not sure if it ever was that hard but if you follow a bunch of people the network effects will kick in eventually, you can also add relays to pull in posts from other servers if you're impatient. A fresh instance can take some time before the known network starts filling in, especially if you don't know who to follow (or have anyone following you), but fedi is a series of tubes: it only pushes and pulls stuff from places it knows. I didn't have problems federating outgoing messages to my friends' instances when I started, but I wouldn't be surprised if some Mastodon servers use some stupid anti-spam measure that keeps low peer count servers away.