I think it is just a noobie stat. Because there were more searches on Bitcoin by noobies at a time that other noobies were telling them that it went from 2 to 4 to 6k, you can see them getting on the noobie FOMO train. Then, when the professional traders took their profit and all of them that invested at 15 and 18k saw their stake devalue much lower than they invested at, they stopped searching.

Your sentiment that they have already googled it and are not going to do so again does make sense. The rush that caused that parabolic growth is the same exit that caused this extended bear market. I kinda don't want that to happen again (FOMO and parabolic growth)as it is bad for crypto. I kinda do but only for a greedy personal gain reason and that will not trump my greater want for solid crypto adoption.

Anyhow, if that mania is gone because everyone rushed in and out in the fall of last year, then good. I wonder if they are measuring the searches on EOS, Altcoins, blockchain and such. That might correlate a little more accurately.