To be fair, over-the-top size spoiler warnings are not new here, there are many examples of them on this forum. And personally, I think it fills part of the screen enough without "accidentally" reading whatever spoilers are below the huge texts as eyes tend to wander unintentionally.
I think only now that the issue of spoilers might be having an affect on people has been brought up, some people might be taking the huge texts the wrong way...