It is rarely used by players with a low ping, since the risk of being sawn or severely damaged while crouching is obvious. However, players with some more significant lag are taking great advantage of the minor c-bug, as it's much harder to damage them or get them stuck to the chainsaw while crouching-standing up because of their laggy movements.
I suggest to disallow the minor c-bug in order to minimize inequalities between players when it comes to their connection.