The free trial is more than generous in my view. It should be a limited and not an open ended trial one can play forever. I would put a time limit on free trial personally. If they want more they should sub pretty simple. If anything I can see people who sub complaining they can't get access because they are not 90 but access to this at the very least should carry a sub to play it.
Comes a time when free trial peeps actually need to sub to the game to help support the development of things like Island Sanctuary and not get up and about they can't access it for free.