It's almost always locking some features behind subscription.

Obviously, SSO is the best choice for most deployments. Enterprises (who will probably pay the most) will require SSO.

Open Source is the "free taste". Everyone knows, uses, and likes Grafana. When your company is looking for something, you'll recommend it because you're familiar with it. Your company will want things like SCIM or similar, and pay them for it.

It's harder for products that are trying to sell to smaller companies/individuals, but it still applies.