Ok you are half correct on this, hiring should be removed but neither is the writer getting paid initially.
Think in this way, there are artists who are willing to start their own series correct?
There are artists who may not have the story in their mind correct?
Then, there are those artists who are present who didn't get opportunity to join on of the manhwa studios.
Then, that artist would find this deal to be beneficial.
You will find many unpaid collaboration on tapas.
But, what makes one a good deal from another is based on your intuition.
I placed my offer, 75% of patreon funds in canvas.
50% of original title.
Then, I showed my book which is in the link.
What you might find to be unfair may be the best choice for someother person.
I told that you are half correct with me using the word hire.
But apart from that you should maybe understand that you haven't done each and every step directed to take the offer in the first place.
Thank you.