IT WAS SUPPOSED TO BE!!!!!!
Just guessing but probably because the developers said this would be free ages ago but have since reneged on their promise.
This should have been free absolutely ages ago. The last time I played it (very early last year) there weren't any issues that should have held it back from its free release. Just trying to get more money out of people...
From the recent patch notes, I'm pretty sure founders will still receive vbucks after it becomes free from dailies etc and non founders (when it does become free) would receive xray tickets instead of vbucks so I advise you should buy founders if you want the vbucks of course (since season 10 might be when it goes free)
Was meant to be the start of 2019 they defo stood to there word lol