people don't search about a topic just to know about it. they also search for the news about that thing they are searching for
for example they can search "why gold price rise, falls,... what is going to happen, how to buy it,..." but they are instead searching all that about bitcoin. it can be just news about bitcoin or gold, or it can be where to buy/sell or simply the price of it.
the total "trend" shows bitcoin is ahead. but the important part is that it is increasing which shows more people are getting to know bitcoin and even if some of them invest, that means more people are investing in bitcoin. and that justifies the current rally.