Psychiatric hospitals across the developed world are discharging actively suicidal patients on a daily basis, because they're marginally less suicidal than the dozens of people who are waiting for a bed. Beyond suicide, there are vast increases in drug and alcohol related deaths in impoverished communities. We're in the midst of a mental health emergency and need all the help we can get.
You're speculating about whether an app might hypothetically dissuade people from seeking better treatment at some point in the distant future. I think my response is downright charitable.
Consider another hypothetical scenario. A great famine has struck. Someone is dying every 40 seconds. The UN start helicoptering in bulk quantities of freeze-dried rations. I remark that there is a great danger in providing food aid, because it might dissuade people from eating a balanced diet of fresh fruit and vegetables. What response would I expect?
Qu'ils mangent de la brioche.