Usually, the term being used for this is rakeback by casinos. But check the percentage as it varies from one casino to another as well as it depends on how much you wagered on their site. You may be looking forward to this rakeback at the end of your session, but you may get disappointed as most have low percentage vs. your wagered amount. But this feature is already good as compared to none. At least get something from your wagered amount at the end of the session.
I also think this is what they mean by "loss bonus". Rakeback is one of my favorite bonuses. It's always a pleasure to get few bucks which alow you to play more after you have nothing left on your account balance. Besides, it usually doesn't have a wagering requirement.
You shouldn't expect much, though. And I believe it doesn't depend only on how much you have wagered but it depends on the house edge too. The higher the house edge the higher the rakeback you get.
When I see that there is a benefit for losses that we have had previously because I like it and it is something that should be taken Advantage of , I do not see that such a Thing is bad, of course I say it from the point of view that we are always in In a casino I have more losses than wins and that's common in all the players I don't know of any player who has done better so far so being in profits all the time must exist because there are people in the world who have that particularity, but I am very far from being something like that, but some are very lucky or play at the right moment, everything has its own good way of seeing things but I know that there are those who have that kind of luck that wow is Something that is out of Bounds.