If you're saying it's "DRM-like" to have a problem that requires software protection to try to solve, I understand this comment.
But if you're saying that Twitter's OAuth scheme is inherently DRM-like, no, it isn't. It makes perfect sense for web apps, and it's been shoehorned into native apps, but the core problem Twitter is dealing with (how can we shut off malicious clients) is totally orthogonal to OAuth or DRM.