It's not a scam, these people work for web novel.
This is an e-mail I received from one of the representatives
There are two types of contracts we offer:
This contract will allow you to earn a set percentage of your book's profits (<50%) while on Webnovel and still allow you to monetize your book elsewhere. Also, you will have to market and promote your work yourself and you will not have access to Webnovel editors. This one is aimed to a completed story or has min. 20.000 words.
If your book is still ongoing and not yet contracted by a third party, I will, however, recommend you to sign the Royalty contract instead as it allows a higher percentage of profits (50%) from your book and also allows the Webnovel team to market your book for you, which in the non-exclusive case you will need to advertise your book yourself. The Royalty contract also grants you access to our Content Editor team who can help you with improving your book's marketability value.
I'm not sure if in the Royalty contract Webnovel has some parts of ownership of your book until the contract is signed? I'll have to e-mail about that arrangement.
Email them back so you can get a full explanation of things. They will give you the criteria for things you need to meet in order to join the program.