Yeah i dont typically pay attention to tags. Tho ive run into a couple promotional series before and i have to say if they want to guarantee people dont check out their products, this is definitely the best practice. The last thing i want to do after getting a good story yanked out from under me like this is go and check out the writers other works or products, all they do is actively make me want to avoid them in the future. What a waste of timeThis wasn't an axe. The whole series was just a promo/teaser for the full LN/WN. The idea is to give you a taste of the story and characters in an easier-to-read manga format then end after like 1 or maybe 2 story arcs to spur you to go find and read the novels. It's a pretty standard practice and I'd wager that more LN/WN adaptations work like this as opposed to just adapting the whole thing or catching up to the novel and branching off to tell their own story.
As someone else in the thread said, if you see the adaptation tag and you're not already facing a backlog of like 30+ chapters then you have to keep it in your mind that the sudden end "go read the novel for the rest!" ending is always a possibility.