Statman,
There's really no issue in a kid moving clubs on their own accord. If they think they have a better chance of progression somewhere else, no worries - go for it.
The only real problem occurs when a coach or club member makes first contact with a kid from another cluib. This shouldn't happen. That is "poaching".
Officially, by the by-laws, this only impacts SASI & State kids. Unofficially, each club should be diligent in ensuring this isn't happening - at any level.
When a player is at a club, and that club invests time & resources into developing a kid, they shouldn't be fielding offers from other clubs. If the player themselves see that perhaps there's no spot for him at his own club, or no chance for them to "get ahead" or some kind of personality clash, then by all means, seek out a new club. You will find that often kids are disenchanted by a lack of success, and thus, often gravitate to the stronger clubs. These clubs are often accused of poaching kids, when in reality, their program promotes itself. Kids want to win & parents like to think they're doing the best for their kids future by getting good coaching etc (and they often feel the successful clubs have the best coaches. Sometimes true, sometimes not so much). The other big reason for moving clubs is if you're in a strong age group at your club & playing div 2, and feel you can have an opportunity at playing div 1 at another club, then often kids will move.
So I guess that's why people are asking whether these played "walked out" or whether they were "poached".