They’ve got all those labour camps on Wano that can be used as (more humane) prisons. And they’ll probably get out to work for the noble job of regrowing the desolate parts of Wano in Udon and Kuri under the supervision of the samurai and Tama’s mindcontrolled slave Gifters.
Tbh it’s only really what happens to Kaido that’s interesting since he’s the unstoppable beast who can’t be held captive. Also chances are one or two of the main Beast Pirates (Ulti and Page One being the favourites, Queen in second) also escape and get some cover story adventures.