Many webserials end, but not many great ones have ended as of yet.
Reverend Insanity was going good until Chinese Government took issue and ordered the author to stop, too much authority bashing within the story.
Void Herald has written three finished good and popular webnovels, 'Vainquiar the Dragon,' 'The Perfect Run' and 'Never Die Twice.' I recommend The Perfect Run, NDT and VtD if you can withstand LitRPG, VtD in particular is a very funny story following a Dragon discovering LitRPG system of his world after meeting an isekai loser. VtD is much shorter and condensed, being a story of a Necromancer in pursuit of Eternal Life and fighting with Gods. The Pefect Run is a super-hero story, with a MC being able to go back in time to earlier 'save-file,' being in pursuit of the perfect run (speedrun, basically), good overall, although meanders before the end and loses some steam, still finished on a good and satisfying note though.
Wildbow wrote Worm like, 9 years ago? Ward a few years later, and two other webnovels, Pact and Twig, haven't read them but Pact is supposed to be good. At this moment he's writing Pale.
Mother of Learning is a classic and everybody knows it, same with Practical Guide to Evil, although I personally dropped it midway through.
Everybody Loves Large Chests is a weird shit, but it was popular and also finished, although it had way too many rape in it for my taste.
A webnovel with actual good NSFW content would be either 'Blue Core' or 'Erogame', with the second one deserving to be called one of the best things written within the last decade or two, some even speculate it was written by Yudkovsky, the author of Harry Potter and the Methods of Rationality (which counts as a webnovel as well, I guess). Another great rationalist work is Worth the Candle, which I already mentioned earlier.
TWI, according to Pirateaba's staff member, is around a bit below mid-way through. So considering it's Pirate we're talking about, you can very well expect 20+ million words before it's finished, provided they won't die. It's their one and only Magnum Opus, I wouldn't be suprised if they didn't write anything else once they finish it, they are already doing 70-80k words a week as it is. Literally one of the most prolific writers the mankind has ever seen. And they are still writing side books and comics during their breaks. Literally a content machine.
Webnovels seem to have gained popularity only recently, and even I don't know that many of them, focusing mainly on RR (Royalroad). There are other websites Wattpad etc. who focus on slitgthly different genres like dramas and romances. AO3, fanfiction.net and forums like 'sufficientvelocity' or 'spacebattles' focus on fanfiction from what I've seen, although there are original works there as well. Most of Fanfiction is trash obviosuly, obviously. But the ones like Methods of Rationality, The Metropolitan Man or Purple Days shine among them.
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