In Lightning, funds can only travel to or through people with direct connections (aka channels). If you have zero connections, you don't exist in the Lightning Network at all.
Discussion
Siloed Lightning Networks, do they exist?
So are the channels I have opened on Phoenix and Blixt are Bernini used by others or just me?
Being*
I'm no expert, but I'd guess almost certainly just you. There are highly connected LN nodes that have channels with tons and tons of people. Some of those connections are to other big nodes in the network. Now they can interconnect lots more people (e.g. you to Blixt, Blixt to Phoenix, Phoenix to Alice).
But you're just a leaf node on that graph (graph theory terminology; there are main trunks, branches, and at the very edges: leaves). Once you get to a leaf there's nowhere left to go. It's a dead end. So then there's no way for someone to try to route a transaction through you.
If you used the same wallet to open more channels, then you'd start to integrate yourself as a small web of routing options for others to possibly use (though, in reality, if you're in a mobile app, that ain't happening. Complex reasons, but basically if you really want to participate in routing payments for the network, you have to run your own bitcoin + LN node at home that's connected 24/7).
Thanks a bunch that definitely helps me understand it a bit more..