Yes, check some of the previous HashiConf keynotes to see the types of customers that are paying for it and which products they use. Also HashiCorp's financials are public, although without a per-product breakout. You'll have to connect the dots between some of these things to try and get into the rough ballpark.

Irrelevant in the grand scheme of things, at this scale of developer community it's all about mindshare. They could've created a compelling paid support or other product offerings, but haven't, or maybe took too much funding and the VCs forced their hand. Regardless, it's a 1-trick pony. Even though they have other cool shit, Terraform is the golden goose, and they just strangled it.

Now someone will fork it to "Terrafoam" or whatever and that'll be it. MitchellH's vision and expertise is no longer critical to the project.