Their website does say that you can pay per image at $1 per image. I am in the opposite boat though. I could see this having a very significant effect on photogrammetry but I would need to process a few thousand images at a time which would not be very feasible with their current pricing model
To the developers. A very promising piece of software for a VFX supervisor like me. BUT, please reconsider your pricing tiers and introduce a per-image price. We are a pretty large facility, but I can only imagine needing about 1-10 images a month at the very most. It's like HDRI's - we buy them all the time, one at a time. They need to be individually billed so a producer can charge them against a particular job.
The Wolf team (a project dedicated to Blender) has a nice pack of free PBR materials for you to check out. The materials here would work great for all kinds of scenes, so don’t miss this chance.
Here are some preview images to get you excited:
Make sure to read this guide to get started.
The pack is updated gradually, so bookmark this page to get more materials.