Mary Jo's in NC tears the fabric. Each time I've gone there in the past 3 years they have done it. Each time, each piece has been straight and when I prewash it, it seems to ravel less than fabric I prewash from other shops that cut the fabric.
I have more issues with fabric cut crooked. Bless them, they cut like me. I can't cut a straight line without a ruler. I will not even try tearing in a straight line.