They have over 450 employees and operate in six different countries. I don’t know what DnD would be worth but it’s not like Larian is small.
Logically I think it makes more sense for Larian to want to buy the video game rights specifically as anything beyond that would be outside their scope.
They can also just refuse to do the job because it hurts the laborers that work for them. They got laborers doing this because they didn’t treat them like people. I don’t think they should expect to be treated well when they treat others poorly.