Yay, yet another decrepit, ancient regurgitation from Crapcom.
I swear they're run by fanboys with a raging irrational hate boner for Nintendo, their Switch support is beyond pathetic given the system is one of the fastest selling ever.
It's just money. And in some cases, like this one, they seem unreasonably greedy.
There's a DMC 1-3 HD collection on PS3/360. Porting it over to Switch should not be difficult to the point where it warrants splitting them up into individual games again.
I think they're just doing this in hopes of exploiting people who have never played the DMC series before. Because people that have the HD collection already are probably not buying this.