There's a thread already regarding this : https://forum.webnovel.com/d/42480-powerstones-for-my-book-disappeared-suddenly/76
You can join and lament there.
And yes, though they say it is general, it seems that for now, it is non-contracted novels that are being targetted. What pisses me off is the fact that there had been NO restriction on mature content, so why now?
It should be told that "No more R18 content. Please remove all". Though we were warned about it, we were also only advised to take off the R18 tag AND make sure the cover isn't explicit. My novel will have R18 moments, but so far, it's just been R16. It's not a smut novel, and those moments are just normal things in the present time.
Who knows what goes on the Hearts of Man?