data lake isn't a new term (relatively). I remember first hearing it when I worked at Google like 5 years ago, and the context was always referring to some enormous raw data store. Probably the term "lake" is supposed to evoke a sense of largeness and shapelessness. If you wanted to train a model, you would tap into a data lake which had up to petabytes.
the FAANG job promotion "game" leads to a lot of new terms being coined because everyone wants to be the guy who invented X. My generation isn't beyond reproach either, our thing was acronyms and clever initialisms.
