They don`t care about it. They just get money from everybody and don`t worry is he addict or not.
But the same time, i don`t think that betting companies need to attract attention with stories of broken lives of addicts, they would be more satisfied getting $5 everyday from lots of common gamblers, who just make 1-2 small bets every day and have no problems with addiction(except money they lose).
It is true that gambling companies do not have time to see if a gambler is addicted or not. They have designed their gambling in such a way that they will win. It is very common for gamblers, especially those who are greedy and gamble for a long time, to become addicted to gambling. They may be addicted because of their mistakes, but it is not the case that the gambling platform will attract them to bet only for their own sake.
Gambling companies, even if they do not want it directly, will indirectly increase their profits as more gamblers are under their control and spend money, but they operate their activities to benefit not only addicted gamblers but also from the whole gamblers.
It is business. They need to get profit and to increase it. You can see lots of loyalty programs, bonus systems, marketing campaigns, etc. All these promotion costs money and betting companies spend it to increase their profit. But i`m sure that they would prefer common gambler than gambling addict - it wouldn`t attract attention. Common gambler wouldn`t cry everywhere how gambling broke his life - he just lost $5, not a problem.