People who have subscribed to Netflix for years will only cancel their Netflix accounts when they think Netflix will not have enough good content in the future.

"Never cancelled a successful show" a fair thing to say when subscriber counts are growing. It's incorrect when subscriber counts fall. A successful show isn't one that gets a lot of viewers. A show is successful when it is the reason people don't cancel their subscription.

I cancelled my Netflix account. If I thought they would continue to put out and support stuff like The OA and Altered Carbon, I would still have a subscription. Instead they decided to acquire a bunch of what would have been considered straight-to-video content in the days of Blockbuster.