I'm not really sure when this started but I've discovered that I have some type of data. My parents haven't included data in my line yet I'm able to receive notifications from discord, youtube, google feeds etc. I can even do google searches or search for apps on the play store. But I cant actually go on a website or install an app. I cant watch youtube videos or read my discord messages. I cant play online games like brawl stars because it wont connect to the server. I can also use google maps and read reviews. My service provider is tmobile btw. Why does my mobile data work for certain things but not others?
This issue is same as yours. t mobile.. no brawl stars.. The problem is with your ISP.
I suggest you to try using a trusted local vpn (check if local one works.. not sure). It won't slow down you internet speed and get the job done too.. I too play brawl stars btw :)