I can read that a couple ways. In this more recent update (dealing with the Dec 2023 payout changes) they mention they’re trying to keep payouts at $130k/month, and that…
“…In advance of customer usage, we store synthetic data and use synthetic egress to maintain that level of payout. We plan to continue to use these tools to keep this average payout rate near these levels until the growth of customer data eliminates the need for the synthetic load.”
I’m seeing mere MB of saltlake data for hundreds of GB of eu1/us1. Perhaps saltlake is their real development testing data… but they’re supplementing non-test-but-non-paying-customer data on the other satellites to make sure SNOs continue to share from that $130k/month? Because that blue line looks awefully artificial 
Either way it’s a cool graph to check every once and awhile!