Freemium simply means there's a free component to a premium service. The premium part could be subscribers, but it could also be a one-time app payment (with a free app equivalent) or even custom services.

Freemium's the odd one out here - it's really a separate dimension - do you have a free offering or not? So any company listed here as freemium should also be accompanied by at least one other (actual) revenue model.

At least with Netflix, there is no free option. I think in this case, 'Subscribers' means that the service requires a subscription to use it at all (whereas freemium has tiered service levels).