Often times if "sign up" feels like a blind commitment, it is the copy or narrative arc of the landing page that is poor and not just the CTA. Also, in some cas

Often times if "sign up" feels like a blind commitment, it is the copy or narrative arc of the landing page that is poor and not just the CTA. Also, in some cases (eg: platforms that have multiple equally important but diverse features, like infrastructure as a service companies) there is not one clear "action" to prompt the user and "Sign up" feels a bit more neutral.