For All Lekostudio UTAUs; R-18 Content is for the most part, allowed since the product is at the end of the day, a vocal synthesizer with no age since only the "mascot" has an age, but taking this rule too far (explicit racism, sex/"hentai", discrimination towards religion, ETC) will lead to mass reporting of your video on whatever app(s) it was posted on, though I don't mind stuff like Rabbit Hole by Deco*27 (this song has nothing to do with any Lekostudio UTAUs) which isn't too inappropriate and is in an actual song. Deriatives are allowed, but for using a voicebank without changing the pitch for your UTAU (ex. using Nano's voicebank without changing the pitch for your own UTAU to avoid making your own voicebank) you need permission from Leko-P, which most likely will be denied unless for a specific reason.