Ultimately gamblers are very likely to keep playing & depositing so in the end the house will nearly always win in most cases, the most vulnerable people don't seem to realise that until it's too late and lesson learnt, it's definitely sad to see and I've done this myself in the past but gambling responsibly at the end of the day and comprehending you'll be able to lose that amount is key, stake also do actually do a good job giving back to users, more than most industry standard casino reward systems, +1!
Put it more accurately, in the end, assuming there is infinity to the end, the house will win, eventually. Not in most cases, but eventually.
That end could come now, or in a thousand millennia, but yeah, gamblers like me who accept that deposit and consider that money lost. And entertainment bought and paid up front for. Just like you would any other form of entertainment.
So the guy in question maybe didn't realise that before, hopefully he does now.