Lemmy servers don’t need to connect to each other to work together. You can always search for a Lemmy link on your server and it will get the post or sub, so you can comment and like and sub etc.
On mastodon someone from your server (or you) needs to follow a person for their toots to arrive at your server. You also can search for a link to a toot by them and your server will look up their profile etc so you can follow them. Boosts work as you would expect, someone you follow boosts something from a person c on another server, but you see this toot since you follow the person that was boosting it.
But does A and C have to connect each other in this case or wouldn’t this be necessary?
Lemmy servers don’t need to connect to each other to work together. You can always search for a Lemmy link on your server and it will get the post or sub, so you can comment and like and sub etc.
On mastodon someone from your server (or you) needs to follow a person for their toots to arrive at your server. You also can search for a link to a toot by them and your server will look up their profile etc so you can follow them. Boosts work as you would expect, someone you follow boosts something from a person c on another server, but you see this toot since you follow the person that was boosting it.