You are right in general though. Going DRM free not only won't hurt any publisher, it will only gain respect from customers and will improve the quality of their products in a sense of improved usability, because any DRM means a crippled product (i.e. limited platforms availability, inability to make backups and etc. and etc.).
The problem is, that most legacy publishers are rarely customer focused and think that DRM helps their profits. And unprincipled distributors like Netflix are ready to oblige. But the irony is, those publishers only hurt themselves by continuing using DRM. It's mostly innovative publishers, or self published studios (and crowdfunded projects) that have common sense and avoid using DRM. Luckily some distributors are also principled enough to reject DRMed products from publishers. But such are a minority still.