You are right, but mostly they will say that they have legal terms and say that they will not be sharing it with others. This is only for their own consumption, but still it manages to leak. This is really the problem now, but in order to signup and play on a gambling website, you really need to do KYC, and now I noticed that privacy is not that important to others since they don't care where they are sending their personal information. The only thing that we are like holding right now is really they terms and conditions about our data to make sure our information are safe
Well you cannot really escape from the world of targeted advertising, no matter where you go in this world. Even in nature there are examples of advertisement. Or at least a kind of advertisement. A good smelling fruit is appealing to animals, animals eat the fruit, poop out the seeds. Their poop becomes the seedlings fertilizer. So obviously this is a good trade.
But as far as the human world goes: I think advertisement is also good but sometimes we overdo it. We go too far. We start annoying people.
Thats the worst part. The annoyance from bad advertising practices.