It doesn't - as a node it's fees are quite low though.

Each LN node sets it's fees & a payment may need to go through several nodes. If you have a direct connection to a node, the fees are always zero.

A node sets it's base (per Tx) fee and a volume (per sat) fee. Your Phoenix wallet is a mini node connected to the ACINQ node, so all traffic runs through ACINQ.

I'd wager that WoS makes most of its revenue moving sats on & off chain. It also makes money as a Bitcoin only exchange.