I indeed don't believe you're cheating.
RHTM is however linking to a thread from BB where they even explain that they consider active day-trading to make money undesirable and list some context in when they believe it is undesired/illegal.
You can check yourself whether your transfers meet 3 out of those 4 criteria. And if one of them does it's no problem, but if most transfers do then according to BB it is illegal.
Crunchy! If you eat fast enough