yeah, always happy to provide info. we were recently contacted for a bid on a services contract regarding a performant api for pulling a ton of different info on cloud services providers. Their interface provides cost comparison between on-prem and cloud solutions for advocacy. Since the enterprise internal network and infra teams are extremely security conscious and aren't on terraform yet, we need to query cost data in a usable format but without the IaC use case.
Major draw of using infracost libraries compared to the tool evaluations they did for data is your venture backing and high historical startup success leading me to believe this service is unlikely to be deprecated anytime soon.
The reason we'd use self-hosting is internal extensibility for future development on our own OSS products