They make advertisements on the internet only for the needs of their casino network so that more people know and play in their casinos or in online gambling. In my opinion, there is nothing wrong with this, but what is wrong is that there are people who play in casinos who do not have self-control so that they become addicted. If they can control themselves while playing, maybe it will minimize the harmful effects of gambling.
the problems continually lays within the gamblers who react in a way that ends up detrimental to them, and that's why most casinos always advocate responsible gambling always on their platforms, gambling it's self if followed the way it aught to be , it's actually fun and not harmful but gamblers abuse it to their detriment because usually anything fun can definitely be addictive.
A gambling company also wants to attract professional gamblers because those gamblers will gamble on their site for a long time. Casinos also don't want gamblers who come in with a large bankroll and quit gambling within days. Because there is no long term benefit from them. So casino companies always try to support those gamblers those who gamble responsibly. Many also give several cautionary messages to those who fall prey to temptation. Now if gamblers are not aware but speak out against casino gambling companies I would say it is their ignorance.