That's right, just gamble on what you can afford to lose because some gambling site did not offer insurance service, once you have lost, that's it, you need to accept that your money was gone.
And gamblers should not always expect that feature. Being a gambler needs a responsible act as no insurance that can cover the loss.
The losses here in gambling are intentional act and not by accident, not the common losses covered by the usual insurance.
Just be thankful that there's a site that offers a Rakeback feature.