I think you overestimate the instant-gratification-crowd.
As I mentioned above, a weekly release has been the norm for the Expanse, only season 4 was the odd duck for that show.
Plenty of shows manage to run and keep running on weekly release schedules on online services.
If you are too cheap to watch it as it's being released, just wait until feb and binge-watch it.
Well my point is more if Amazon are doing this to get more money, then yes, it's what they do, they're a corporation.
They're clearly experimenting with different release schedules at the moment - all their shows were dropping on a single day for a year or two, and now they're trialling this three episodes then weekly thereafter model with The Boys series 2 and The Expanse series 5, it's a middle ground between Netflix's all in one go model (with caveats for shows they license from other sources) and CBS All-Access and other services doing weekly episodes. Streaming services don't work on an advertising model (with caveats like Hulu or the cheap CBS All-Access model), so Amazon and Netflix especially want to gain new subscribers and retain present ones. It's still a new business model and there's a lot of experimentation, and a lot of it is
highly cynical, like Netflix cancelling a lot of shows after a couple of series because they're not drawing in new subscribers any more. Amazon's new scheduling experiment is more of the same.