Sure about that? 
Since when have they not been able to climb there?
One could debate which populace has been ‘enlightened’ more by ‘modern educayshun’ [1] 
, but what is the point… Since when has skill played a decisive role in this game anyway? 
At top ranks, it would seem that allegedly rigged matchmaking and so on have a greater impact anyway.
Besides, with bots abounding, the overall level of the whole ‘legendary’ league is obviosuly lower, isn’t it? Thus, this tendency (namely, fewer bots being on EU than AM servers and so on) would pertain to virtually the whole ladder, I’d think.
[1] https://www.youtube.com/watch?v=iKcWu0tsiZM