Weighing the harm of loss against the benefit of entertainment is one way to decide. An alternative viewpoint is whether the freedom to gamble is more or less i

Weighing the harm of loss against the benefit of entertainment is one way to decide. An alternative viewpoint is whether the freedom to gamble is more or less important than protecting the irresponsible. You may also want to consider that your non-participation in an activity may not affect whether it happens or not. Arguably, there will always be a provider of gambling services where it is legal (and maybe even where it isn't). From this perspective, the most ethical choice may be to be to provide the most ethical gambling service. However, this may be commercially challenging. Ultimately, only you can decide whether this is ethical, as ethics is subjective.