question about PS4 version

[Alcyon_Densetsu]

NO. No PS+ subscription required to play MMO's, F2P games, use Netflix, Hulu, etc.

It basically works like this: if the servers are not operated by Sony, they won't require you to have a PS+ sub.
Sony provides servers for developers to use, in the case of multiplayer games etc., in which case you obviously need to be sub'ed to PS+, but Sony won't force you to pay when it doesn't cost them anything.

That's a big difference with the Xbox 1 where you must pay for all online services, including the ones who don't cost a cent to Microsoft.