I've always been an advocate of banks muscling in on Responsible Gambling controls, as it seemed to be the most direct way of curbing one's spending on such vices. In fact I'd be all for the UKGC 'mandating' all banks set up various options by default.
Not overly enthused at banks seeing that as a means of taking the customer's autonomy away though, and start regulating their gambling outgoings, as I fear this may eventually lead to.
I'd also imagine banks don't view customers that use these 'blocks' favourably, with credit scoring bound to be impacted in the long run. To them, these types of customers are probably just about 'tolerated', like mother-in-laws.
If these tools ever become fully realized however, then they can only be considered a boon for gambling self- control. But they'd better have a good reason for stopping my gambling transactions or else they may find some civilized hostility headed their way