BlueBurning "... forever unlocked since it was paid by our subscription."
I'm not a fan of some of Webnovel's business practices myself, yet this just seems silly!
You paid for access to read; not for the novels themselves, right?! Would you cancel a Netflix subscription and still expect access to the stuff you already watched to be available after no longer being subscribed? Not for one moment would I ever expect Webnovel's subscription to work how you seem to think it should.