As with all these sites, they can be seen as having some truth, but also some misinformation. The degree of each will depend on exactly how the information is gathered, how representative it is (ist’s often sample based) of the whole population (Bitcointalk’s Traffic), how the extrapolation takes place and compares to other sites, and so forth.
We get some glimpses of what’s under the hood here:
https://support.similarweb.com/hc/en-us/articles/360001631538-SimilarWeb-Data-MethodologyThere, it states that data is derived form 4 different sources:
• Direct Measurement – millions of websites and apps choose to share their first-party analytics with us. Learn why here
• Contributory Network – a collection of consumer products that aggregate anonymous device behavioral data
• Partnerships – a global network of organizations that collect “digital signals” across the Internet
• Public Data Extraction – an advanced algorithmic engine that captures and indexes public data from billions of websites and apps
The forum certainly isn’t going to be amongst those that share their analytics with them, people using Bitcointalk tend to try to be somewhat private, therefore contributory network data should be a misrepresentation at best. The remaining two sources are darkboxes to me.
The only real sources I’d trust would be data provided by the forum itself, which I’d really like to see, especially for trying to determine the weight of unique visitors per country vs local board’s theoretical potential. VPNs though are likely often used here, so even so the data would need to be read with a grain or two of salt.
Otherwise, I don't see how they came with that number lol.
