[benatkin]

It might be more than just a EULA. Often to sign up for an API key, you have to go through a bit more explicit agreement to a ToS than there is in a standard funnel. There's also a bit more of an expectation that people will actually read them (and are competent to understand them).

[jjeaff]

This extension doesn't use the API. It just injects some JavaScript. Just like every adblockers and password manager does.

[benatkin]

I know. I think the author might have been interested in the API and signed up separately, though.