I'd agree with that. The games and mobile companies and platforms like Facebook are responsible for addictions Worldwide and the general loss of social skills, but are universally accepted.
Suicide prevention is a noble addition to our shirts, however there are endless causes of it. Whilst gambling may be a contributing factor in some cases, it is only a small piece of of the overall picture. Drugs, drink, relationships, mental health, lifestyle, work, trauma the list continues ad infinitum.
Separating the business side of things from the charitable side of things is essential here. Both can work on our shirts. I'm sure Paddy Power contribute greatly to the specific addiction charities concerned with their markets, with the likely implementation that they will have to contribute an even greater amount through evolving legislation.