One should note that in Eretz Yisrael, notices against speaking Ivrit are posted in Hebrew.
Frum Yidden always spoke and read Hebrew. Aramaic was “mama loshen” only for a relatively small area. Jews in Egypt and eastern Europe spoke Greek, Jews in western Europe spoke a Latin (from whence we get such Yiddish words as “bentsch”). When Jews went from one region to another, they always spoke Hebrew even in modern times (e.g., you don’t find accounts of Ladino classes in Warsaw, or Yiddish classes in Salonika – when Warsaw and Salonika Jews got together they would communicate in Hebrew).