I don't agree that $90/user/month is unreasonable in every context. Yeah it's probably too much for consumers but honestly the consumer need for this tool seems pretty niche to me. It's also probably too much for large enterprises where you'd have a lot of people who want the tool, but they're probably going to either build it themselves or pay $$$$ for big lame ETL tools.

For mid-sized companies though that could be a bargain. I worked on a data migration project at a company with <100 people and <5 engineers where we had to hack together our own data-diff tools and this would have been a bargain.