Overly permissive licenses does not protect most business and benefit the few. Propitiatory forks at the project and file level favour large business able to support the large development teams required to support the fork. When a permissive license is used I know as small business contributor, other large business will keep their best improvements internal. This means my project will be inferior.
Licenses mandatory sharing are much more farourable with a level playing field.
As a business contributor I am afraid of permissive licenses which may leave my business at a disadvantage.
As a personal contributor I could care less about the license and want as much interest in my code as possible.