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Thats partly what I was on about before. See the image in Google Trends, and the list of top countries where a given term is sought, is always expressed in relative terms (*). Since we know the source of the chart provided by @Debonaire217 is Google Trends, we can at least go to the site, and find out what it tells us about their method to obtain their information. That way, when we Nigeria figuring as the top country where the term "Bitcoin" is sought, we can understand that data is relative, and not absolute.
(*) Relative terms here means that Nigeria, according to Google Trends, searches for the term "Bitcoin" in greater proportion to all Google search terms in Nigeria than any other country. This is therefore in relative terms (relative to the total number of searches in the region), but not in absolute terms, as those shown in the OP. Thats why Im particularly interesting in understanding here where the absolute values in the OP came from.
For example, say that the term Bitcoin is sought in a given timeframe (made-up numbers):
1. Nigeria: 100.000 over 10.000.000 searches. -> Ratio 1,00%
2. South Africa 120.000 over 13.000.000 searches. -> Ratio 0,92%
3. Austria 250.000 over 28.000.000 searches. -> Ratio 0,89%
4. Switzerland 55.000 over 12.000.000 searches. -> Ratio 0,46%
5. Ghana 80.000 over 100.000.000 searches. -> Ratio 0,08%
So, in the above scenario, Nigeria would figure in Google Trends as the top country searching for the term "Bitcoin", despite it being the third in absolute value of the above list.
The charts work in a similar manner, where the peak search date ratio is taken as the 100 value, and all other data points in the chart are the result of relativizing the ratios to the peak ratio.
Edit: Comparing some of the terms in the OP, Google Trends only shows "Bitcoin" as significant:
https://trends.google.com/trends/explore?q=Bitcoin,%22Bitcoin%20price%20today%22,%22Bitcoin%20price%20USD%22,%22Bitcoin%20News%22