PlayStation plus is an online requirement, that is needed to play multiplayer game.
However there can be expectations. There are free to play game available of PlayStation network that does not need a PlayStation plus subscriber. psncodesfree.club
There no way you can play online multiplayers games like call of duty and GTA, without a subscription. Some of the free to games available can be listed as follows
Moist of people are sick of the same battle royal games. Thus they are searching for something new.