When they dumped all of that discovery network garbage on there I knew my days with the service were numbered. When they canceled winning time (the one show they had left worth watching imo) and ended it with the Lakers losing, I knew it was time to leave.
A spoiler? Dude, it's covering things that actually happened.
They just stopped making it abruptly because HBO are assholes and I wouldn't recommend wasting the rest of your time unless you like watching unfinished stories that are concluded by blocks of text like a fucking Wikipedia article.
The plot follows actual events very closely.
I suspect if they had known they were getting the axe they wouldn't have spent nearly the whole season detailing the year they did.