They really don't. Although I'm not following that much those streamers and content creators that focus more on gambling I see them once in a while, people should be careful with their strategy of convincing their audiences. I think there's a psychology impact why these advertisers are also choosing some line of audience like an age bracket that they're targeting through these streamers because they're likely to be the ones that are very much active.
it's hard to make a general rule in this case
some streamers probably care
some others probably don't
copywriters will say that people care only about themselves
we always had psychology impact from marketing in all kinds of ad styles, this is just getting more sophisticated with the use of pixels and advanced tracking systems that can predict what you want or implement desires you didn't have before.
Adblock is a must for surfing web 2.0 nowadays
The adblock is needed but when it comes to streaming, you can't block those sponsorships that the content creator that you're watching. Whatever the channel or video they have advertises, you just can't block them. It's a different type of advertisement that we can easily block if it's from the provider itself but if the advertisement is coming from the content creator alone and is include to his content then there's no way to block them unless you don't watch the person.