How do Sentinels make money?

I'm curious to know, how exactly does the Sentinel network generate revenue? Is it through transaction fees, staking rewards, or perhaps a combination of both? And how do these earnings get distributed among the Sentinel nodes participating in the network? Additionally, are there any other mechanisms in place that contribute to the overall profitability of the Sentinel ecosystem? I'd love to gain a deeper understanding of the financial dynamics at play within this innovative blockchain project.