~ Gambling industry is really become profitable due to this behavior.
Gambling industry doesn't profit from people's illnesses, it profits from the house edge. In fact, if there were no gambling addicts, and, as a consequence, less governmental restrictions, gambling industry would only benefit from it. So, compulsive gamblers cause harm not only to them and their families, but to the gambling industry as well.
I can't say that I truly disagree with the point established
With that said, however, I don't think it is quite correct to say that the gambling industry doesn't profit from people's addictions because it profits from the house edge. Technically, casinos profit from the house edge as it all eventually comes down to it as luck gets completely removed in the process (even if you don't agree with the latter)
But would you agree if I started to claim that fraudulent scheme operators profit not from their guileless victims but rather from selling their "tokens" even if it does in fact technically come down to selling some coupons allegedly representing value? I don't think you would. But how is that different from casinos profiting off their players, addicted or otherwise?