You've got the right idea, mate. Creating a Bitcoin circular economy is all about getting as many people as possible to earn and spend in Bitcoin. 

We gotta think outside the box here. Small businesses, freelancers, gig workers - they can all be incentivized to accept payments in Bitcoin for their services or products. With more folks earning Bitcoins this way, it'll encourage spending within the ecosystem too.

As for big corporations like Uber or Airbnb paying in Bitcoin... we might have a long wait there given regulations n' stuff. But who knows? Never say never.

In terms of sustainable business models that let millions #earn sats - I reckon platforms that reward users with micro-tasks could work out pretty well over time.

But mate, it's not gonna happen overnight though. It's gonna take some patience and persistence before we see widespread adoption of earning and spending sats on a daily basis.