Your claim about this game being “so dead” is false when going by games created -
https://www.warzone.com/Forum/740107-games-created-date.
There is a way to compare accounts created but I haven’t got round to it.
Seeing how long players are active for is impossible (some players always stay for a while then go for a while, so inaccurate data; possible to get around that issue by querying games but that would take forever because not all games are accessible using API so would have to be done manually. Also players have ability to delete their account so there would be an unknown created and last seen date so would get inaccurate data) and would likely end up being a TOS violation.