By any practical measure Apple is indeed paying in that they gift the show with free iPads / iPhones / Computers / etc. Hence why the credits usually say that "promotional considerations" were provided by Apple.
However as others have said, Apple appearances do tend to be much more subtle, insofar as a big Apple logo is subtle.
And the fact is, Apple wouldn't really need to do that. I mean, how often have you seen scenes where the character was clearly using am iMac but the Apple logo was covered by a post-it or something?
In those cases, Apple is clearly not paying to have their merch being used and the show clearly didn't get approval to "officially" use the Apple logo which is why they had to cover it. But, in the end, it is still clear that this thing they use is an iMac.
You don't need approval to show a logo on a prop. The reason the post-it is there is to provide an incentive to the company to sponsor them. No money, no logo.
By any practical measure Apple is indeed paying in that they gift the show with free iPads / iPhones / Computers / etc. Hence why the credits usually say that "promotional considerations" were provided by Apple.
However as others have said, Apple appearances do tend to be much more subtle, insofar as a big Apple logo is subtle.