The least they could do would be to give people the option to download these modding tools on this site if they can't get them at the store they bought the game at.
I'd never buy from a platform that wants to make games exclusives on PC. I don't even play the free games Sweeney pays but always take them hoping that it is a financial loss to epic.
And most of the mods just added features from Warband that should've been in Bannerlord or planned to be added to Bannerlord from the start.
Releasing features from Warband as a DLC would be quite sad.