I want to use Leovegas as an example througout this post. I myself have nothing against Leovegas, nor any their affiliates. Its plain simple just the casino I have the most experience at myself (Therefor the easiest for me to form a post)
First off all, a casino is a business. Their number one goal is to have you throw as much money at a casino as possible, for them to make as much money as possible. This business involves a-ton of money wich they tend to use for advertisment (To have people to remember their name, to get them to their site, etc)
A casino is intended for entertainment. There is never a guarantee given that you are going to go out of a casina as a "winner". What I like to think when i do my deposits, is that theese 50quids is foreverlost. Just as if you where to be going out for some drinks.
Leovegas, Rizk, amongst others have very good options for making you stop at the right times. You just have to enable them yourself, and stick to the limits you have set. A casino is not your mother, and is never going to tell you to stop playing. This might seem harsh, but its the hard truth.
Most streamers that i find legit to watch, takes gamble responsibility really seriously. Often they have links to various helpsites, and also informative text etc. And they often encourage to save some of the bigwins that the viewers talk about, or share in forms of images or video for later times.
Alot of people are having a bad time related to gaming, but i dont find it the streamers responsibility to filter out theese people and help them. The streamers is just for entertainment. You have to be able to choose for yourself if its healthy to watch. When you are legally old enough to open accounts on the casinos, you are legal wise stated as old enough to make your own decisions in life.
If you have paying attention watching lets say "LetsGiveItASpin" you know these guys also go on super cold streaks, and there can be far from each cashout. He do not deny this, or fake it by any measure if things go south.
I would like to state that everyone on this forum as far as i have seen is supportive for people that are open about their problems, there is even an "responsible gaming" underforum where you can litteraly go out and ask for help. I myself think that Casinogrounds, related caso sites and streamers do their outmost best to help people.
More measures can always be taken, but its just out of their controll over the ones taken IMO.