VS has had a different approach since their launch and I think they are indeed standing out from the crowd.
It is funny though how we always read the negative stories where people bust out. I haven't seen a single player posting that he finished the wagering with that 1 deposit only and had the full bonus released. There are surely plenty of those who are doing it successfully.
FYI, you can make further deposits and keep wagering on the bonus until you get 100% of it released. Your decision though if you want to do it. If not, make sure you forfeit the bonus under "My Profile" when your balance is "zero" and before making another deposit.
However, even when depositing more to get the 100% released, it will work out to a similar value as not having the bonus as you will not advance in the casino race or get cashback while wagering. In clear words, you deposit more and wager - bonus gets released in 10% increments up to 100%. Or you forfeit and get cashback, trophies and advance in the casino race.