Not sure I fully understand that. Most brokers have been capping total loss at zero balance for a few years now. Plus, the '**** or bust' punt has always been the most common trade as the majority of people who have spread bet accounts have it for the purpose of gambling.
Part of the issue that the industry in the UK created for itself was due to spending the last two decades telling everyone that it wasn't gambling and that it was investing. For a very significant proportion of spread bet traders it has always been about gambling and always will be.
It took me years to come to terms with the raw fact that most clients that you speak with are trading for the thrill of the punt. You can spend hours talking to well educated, smart and prudent clients who agree with everything that you say about trading in small size, limiting risk etc etc but they will promptly go all in on a punt because that is the 'fun' that they are looking for.
Ironically, back in the 70's IG only lobbied to get spread bets under the financial regulator as gambling debts weren't legally enforceable. A huge percentage of all activity has always been just people having fun punting