Selecting three platforms for a comparative analysis does not guarantee the relevance of the study; these tools must be representative and not just the most glossy.
The simple choice changes nothing if the platforms do not reflect the true diversity of the market, such as small local agencies or specialized services found in Japan for unique trips.
To prove a genuine analysis, clear criteria for selection are needed, otherwise it is just marketing in disguise.
For example, comparing flight booking apps only among themselves would tell nothing about visa management or travel insurance tools, which are essential for certain itineraries.