The $200/mo Claude plan is not available for every employee. You can buy the $100/mo plan for up to 150 people, and then you have to switch to API billing.
Yes, token use can be tracked the same way, just have to MITM everything. The ToS is a non-issue as it's not a legal issue, unless you plan to do business with Anthropic, not really an issue as you can always go to API later-on, in which case, Anthropic can't supposedly "ban you" as they are saying they don't record prompts.
This is probably the fact that Anthropic's website serves different ToS based on your source IP. European ToS for the subscriptions forbids commercial use.
Those plans are going the way of the dinosaur, ai provider loses money on them. Most enterprise offerings are already there, Anthropic changed theirs to $20/seat plus token usage a couple weeks back
You're welcome to have opinions on that, but the answer to the person's question is objectively compliance. A corp can't get enterprise features like ZDR without switching to token based billing. That's why they aren't using subs.
This isn't some kind of new thing. There's always been an enterprise tax, like SSO.