I read two novels on Webnovel. I'm a reader account, not a writer.
As a reader, webnovel has a little tracker in the top corner for how much of the novel you're read (3%, 70%, etc). I can read their premium series FOR FREE up to a certain percentage. I currently read The King's Avatar (Chinese original) and read up to about 90% completion before having to pay to unlock chapters. Another novel I read is Release That Witch (Chinese original) and I could read up to 70% completion before having to pay to unlock chapters.
The webnovel pay-to-read system is that you can earn 10 stones for logging in/check-in every day. The novel series chapters require between 7-10 stones to unlock depending on popularity ranking (7 stones to unlock RTW at ranking #4, 8 stones to unlock TKA at ranking #3)
I also can earn additional stones for doing "quests" like changing my profile, activating my email, inviting other users, and so on if I don't want to pay real money.
If you plan to join Webnovels as a writer, I can say that you can publish for free, and hopefully you can get your series to become premium. The good thing is that premium novels are still VERY ACCESSIBLE TO FREE READERS, unlike Tapas where readers didn't even know free comics existed.