I've already gone on several rants about webnovel in the other thread that @nostalgicroxas linked but since you mentioned you're writing bl, there's something else that I'd like to add and that's their attitude toward bl and LGBT+ as far as I've perceived it:
They recently had a post on their forums about how they don't tolerate bullying and want everyone to feel safe and welcome and that users should report such behavior. Now, as someone who has posted 3 bl novels there, let me tell you that I have gotten reviews and comments that have: vented about bl (still ok), ranted about 'the gays' (not so ok anymore), called me a 'fucking gay' (seriously?), spewed some toxic bullshit along the lines of who they'd like to go to hell (in a much more direct way and with literal meaning). I have reported these comments/reviews and the users that made them. Webnovel never got back to me, didn't delete the comments/reviews, didn't ban the users, nothing. They do not care at all if you are harrassed for writing bl or being LGBT+.
They originally didn't have bl novels but later added some (I believe three?) which received backlash from the community. This isn't necessarily on webnovel themselves but, yes, a large part of their audience hates bl and queers and will tell you so both in comments/reviews and the forums or anywhere else (and if they don't hate it, they at least don't want it clogging up the space for their het romances and harems). So if you want to post there, do expect to get more than average hate for it compared to other sites.
By now, they have also contracted some original bl novels but I don't think I've seen any new translations in the genre pop up. So clearly, bl isn't really a big priority for them in regards to getting a bigger variety to offer (they have at least two new translations every week so I feel like there should have been one every now and then - also, I don't think they have any translated GL?). They'll approach you sooner or later if you are high enough in the genre ranking though so actually getting a contract if you want one would be an achievable goal as a bl writer.
Speaking of genres: lol Your bl novel will be under the 'female lead' category. Because all gay men are apparently women now and/or only novels with female leads can have romance. Authors (and readers alike) were not amused when they made that change but webnovel never actually cares so tough luck.
The one plus that I'll give to them: The readers that actually do read bl on there are really lovely. Not super vocal for the most part (like, I get maybe two comments a chapter for a novel with 1k+ collections (aka following people) and exactly 0 comments on average for my series with 9k followers, lol) but those that do leave you comments are super nice and you can actually have conversations with them in the comments. Every now and then, you'll get a binge-reader that'll comment the heck out of your whole story which makes it feel a little like it's worth it. Overall, you might post into the void though no matter what your other stats look like.
Would I recommend posting on webnovel? Absolutely not. In fact, I'm personally in the process of taking one of the novels down. As in: delete it chapter-by-chapter because - as somebody mentioned already - you can't actually delete the novels. Neither can you delete your account if you have a novel on there btw, just in case you were wondering how fucked up it really is.
So. Rant over 