The word "just" implies that getting enterprise clients is easy. If they're established (i.e. old) enough and their support is good enough to justify the price point and support substantial enterprise revenue, that's a fine differentiator.
- Compliance - Support - Security (not keeping things secure - offering custom security options. SAML, user roles, permissions, IP whitelisting, etc) - Customization
Building to support big complex customers is hard and if you get it right from a product and sales perspective, the inertia you can build is massive.