First deposit with Cash rebate, only that offer way, work similar to initial deposit gift. If player obtain 50% cash back reward below $100 and lose $200 after account load, the casino shall give $100 back. This can usually be withdrawn, but make certain to read T&C of your bonus instead of blindly take on faith.
Daily/Weekly/Monthly cash-back. This various kind of arrangement awarded by better part casino to VIP gamblers playing within high stakes. Casino might promise 10% rebate on your losses or let's say 0.2% rebate of all the wagers made that is credited either daily, weekly or monthly.
Cash-on-top is a pretty rare arrangement, but seen it before. This looks like promotion that live casinos run time per time catching playing players. Dealers offer amazing extra 20% on blackjack wins up to $200 if you play for X quantity of time or wager gambler with Y sum of money. So this would mean if you catch lucky - win $1,000, they would credit your account with an extra $200.