Captchas are used to distinguish between anonymous humans and scripts trying to impersonate a large quantity of unrelated humans. The other way of preventing so

Captchas are used to distinguish between anonymous humans and scripts trying to impersonate a large quantity of unrelated humans. The other way of preventing someone from impersonating many fake people with a script is requiring actual verification of identity - that's a higher barrier of entry and (for now) requires country-specific solutions and so is harder to internationalize/globalize, but this seems the direction the world is moving towards.