Original clunky title: How do ActivityPub instances’ people initially find remote instances’ people/communities/channels/etc. to vary their feeds?
Given that an instance won’t see remote instance’s people and stuff to follow/subscribe to until someone there has found them and followed/subscribed…That’s generally how ActivityPub works, isn’t it?
“Trolling big instances” sounds bad but I’m guessing that’s a typo/fishing metaphor. Or maybe someone read your tip as “go through your instance’s All feed” instead of “go through some other instance’s All feed and copy links”.