I believe the google search trend may be heavily affected by the crypto ad ban. Since january, facebook google and nowadays even twitter are are baning ico advertising and any other ad about cryptos. It seems like this is kind of stopping people to search for it, because less new private investors hear from the sphere and are joining the club.
The fear is real by the big companys out there and once blockchain is fully developed, they know it is the superior technology and will overcome them.