I have never ever had mold in my jars, not even when I kept the jars closed without any aeriation for 7 months at 67% RH.
Word. If you get mold in cure its already in everything you own.
The answer as to burping, depends on strain. What state I'm growing in, so many things. After the first week the opening of the jar is all about collecting data. The first week is all by ear. Too many variables to worship numbers.