Because you, the receiver of the channel, can't double spend it. So Breeze/Phoenix/whatever have no risk in accepting LN payments to and from that channel.

Of course, you have a risk that the channel provider will double spend the transaction. But that's a low risk that people are willing to accept. Particularly when you're likely trusting their software anyway.

petertodd

Can you explain a bit more what you mean with that? How can a channel be usable if the transaction is not included in the blockchain? What are the risks in doing so?

rblb

What if they never get in block for that price?

designsats

bitcoin

Is Breez subsidizing channel opennings? 

The transaction doesn't actually need to confirm for the channel to be usable. So they may just be low balling fees and accepting that the channel txs might not confirm any time soon. 