Yeah im very concered about riding it to be honest. If i cant get it warrantied, i doubt i'll use it as a proper road bike. Might throw a clamp around it and use it as a beater bike. It'll still fail eventually, but it won't be catastrophic.
Re: the stickers - there wasnt a sticker on the crack, i just noticed it while peeling stickers from the seat tube. It was a hard crack to notice before i scratched off the paint surrounding it. I missed it when i inspected it before i bought it.
Im really bummed, i hope i can get a warranty replacement.