Doubt the style of grind, smiling or straight has anything to do with cutting yourself. If anything, a smiler would be less likely to cut you, as it is an automatic scything cut of the beard.
It is either shaving technique or more likely a chipped or rolled edge. It can take a bit of technique to properly strop a smiling razor, depending on the amount of “smile.
Yup, easier/faster/cheaper to grind a straight edge
Is stropping a smiler different than a straight blade?