So when you "take interest" or "take advantage" or "take a look" or "take your time", what tangible good is being "taken"?
When you "take pleasure in something", like say a TV show, you are deriving value from it. What tangible goods are involved here?
When somebody provides you a service -- say washing your car -- you are still taking value from it even without a single tangible good being given. Or would you not pay the person because no "tangible good" has been given to you?
English is a rich language and pedanticity does not help this debate. Instead, you may want to address the core argument: when someone provides value (again: goods AND services) to another party and does not receive acceptable value in return, it is considered immoral, which is why society has made it illegal.
And yes, the word "theft" is prefectly suitable in this case. Otherwise you should explain why all of these involve some loss to party and are immoral / illegal without a single tangible good being "taken": https://news.ycombinator.com/item?id=44917565
