Given that the account was initially busted for being that of a minor, how come it was still OPEN
Since when do casinos bust a player for fraud, but then leave the account open for them to enter and play again another time? It looks more like the casino did NOT consider this case fraud at all, but a simple matter of a 17 year old jumping the gun. They decide instead to leave the account intact for when he reaches the correct age, when he would be welcome back. This would be why the account was open, and he was allowed to deposit.
Using the original account is the better approach in terms of the "one account per player" rule, yet the "correct" approach here would seem to have been to sign up afresh as an over 18, and make a clean start.
Given that the latter play was legally OK, to go to the draconian length of seizing deposits seems way over the top. Even true frauds sometimes get their deposits back, even with not a shred of mitigating circumstance in their favour.
Freezing an account is not the same as seizing the contents, which is what Bwin has done in this case. To seize the content, a private business has to sue for damages, and ask to be awarded costs and compensation. If they win, they still have to return funds over the amount the court granted them.
Bwin have the advantage here because they have the money, but by seizing deposits that were not lost to the house, they are on shaky legal ground. The reason many casinos return deposits in disputes is to avoid standing on this shaky legal ground for longer than is necessary.
Since this case is about the return of money deposited that remains in the account, and not the payment of winnings, the regulator may not be the most effective way to pursue this. It may be possible to pursue this under the laws of the players' own country. Gibraltar do not seem to recognise the norms of consumer protection law (they are not the only one either), so tend to allow unfair contract terms to stand. Most countries have extra protection in law for consumers in disputes with businesses. Gibraltar for example, have allowed the vague "spirit of the bonus" rules to be use for the arbitrary confiscation of winnings from players who otherwise broke no bonus rules, nor the general terms, but just played too cleverly for the casino's liking. It's no different to the player demanding their money back because the software seemed to use a biased deck in a single session, which happens quite a bit in Microgaming Blackjack, saying "I didn't like how the dealer kept getting 21s off 5 and 6 ups, so I want my money back".