This thread has a bit of deja-vu.
https://pinside.com/pinball/forum/topic/stern-pinball-announces-new-president-
Lots of fear for the DLC route about 15 months ago when Seth joined. So far, all the Insider Connected features have been free. I'm sure they will try charging for content at some point however.
The closest thing to DLC they have released is toppers with exclusive modes.