German contract law has the notion of "unexpected clauses", especially for terms of services. Certain ToS clauses have been invalidated by courts even if the customer agrees to the contract that includes those ToS, because the clauses have been deemed "too unexpected". The basic idea is that people should not be expected to read the entire ToS before agreeing to them.

To me, this is sort of the same: When I visit github.com, my mental model says that GitHub will know about this and be able to run scripts in my browser. However, it would be "unexpected" in this sense, and therefore IMO deceptive, that visiting github.com causes my browser to run code from google.com.