I don't always consider ethics at all in logic, so I guess you can call it ethically myopic.

Installing safeguards to prevent a tool from being used for certain things is a perfectly natural and common thing to do when you are providing the tool as a service. For example, blocking VPNs and open proxies from accessing a free service if those are a major source of spam and abuse. Note that Anthropic never provided the model for offline use in a form that includes DRM -- they are simply safeguarding the service that provides access to the hosted model. The only ethical concern I see here is that some of their safeguards are ones I wouldn't personally agree with, and in a world where dependence on a model is expected it can become an issue if the model refuses to perform in some cases, etc., but that doesn't automatically mean the refusal itself is unethical unless that issue was known and expected (and unless the alternative is not bigger, worse bads)

Also note you are not even "digitally renting" anything. This is the exact same type of thing as, say, real humans in real life refusing to perform services for certain clients or under certain circumstances. Networking makes it possible to decouple some of these things, but that doesn't magically make it renting or automatically turn a refusal to perform services into an attempt to control clients. Just the same as I can choose to refuse any request, which does not automatically constitute attempted control over the asker. There can be ethical concerns about whether my refusal causes problems that I'm obligated to avoid (and whether or not such obligation exists), but that doesn't automatically contaminate the refusal itself unless I have knowledge of and intend the bad.

To use a much more relevant example, Anthropic's refusal to allow its models to be used for war (among other things) does not constitute any attempt to prevent war. It's only a refusal to assist in it. That's not some unfair, unethical attempt at controlling the government, that's just Anthropic not wanting to be responsible for assisting in war.