Anthropic's Enterprise plan is per-seat, but that's just for access, isn't it? The actual usage per seat is billed at API rates. https://support.claude.com/en/articles/9797531-what-is-the-e...
And once you can make a certain threshold of commit, the seats are free and all you pay is usage. They are definitely making a margin on the usage.
In other words, this article is, I wouldn’t say misinformed, but definitely underinformed.