It's not so much about relays being "junk".

It's more a question of where do you want to hang out?

You can join a private relay where only you and your friends exist, or a paid relay where only people who paid exist, or a public relay where most people go to.

Or maybe a combination of those. Maybe you only want to read global posts from paid relays but you still want to participate in public relays.

Read about how Nostr works. It's very different from the social media we're used to.