This site is written by one person with four years behind a counter in Bangladesh. It is not affiliated with any provider, it takes no payment for mentions, and it does not sell anything.
Numbers on these pages are drawn from a single counter's books over those years. They are honest for that counter and should be treated as a starting point for yours, not as a benchmark.
Where something here turns out to be wrong, it gets corrected rather than quietly removed, and the page says what changed.