Netball originally came from basketball but evolved as a non-contact sport in the early years of the 20th century. It was deemed suitable for women to participate in, being a game of adroitness and expertise, not rough-house play.
In the past 10 years, as sports have competed for broadcast space and more explosive action is called for, the shoving and attitude in netball has been amped up.
The rules of netball say contact is only permitted provided it does not impede an opponent or the general play, and players must be at least 90cm away from a player with the ball while attempting to defend. There is room for interpretation there, of course, and that's when the officials come in. But players will push rules to the limit and in some cases it's in for a penny in for a pound - if you transgress, do it full-on.
It may well be that the kind of netball being played by some teams is acceptable to those who run the game. But let's at least acknowledge that.