I can’t confirm that they do or do not pay royalties. But I have had some Crackle placements up to 2 years ago, and have not received any royalty money for the placements.
As for my personal experience – I have had music in several episodes of Jerry Seinfeld’s “Comedians in Cars Getting Coffee.” It is one of the most watched shows that airs on Crackle. So you would think I’d see even a fee bucks for this. What I was told was although ASCAP does have a deal with them – Crackle has not turned in any performance data. And although they are “required” to do so – nobody is hunting them down to do it. So what that equals is the money is not getting to the composers. Keep in mind this is only what I was told by ASCAP – May not be the exact truth.