Halo: Campaign Evolved had a strong launch day in the US, but you may or may not be surprised to hear that it appears to have been more popular on its home turf than on PS5.
According to analyst Mat Piscatella, Circana's player engagement tracker shows that on July 28 – Halo: Campaign Evolved's proper release date after leaving its advanced access period – it came in fourth place on the US's ranking of daily active users on Xbox. Although it might have missed out on the bronze medal, Piscatella notes that "8% of total Xbox players on that date launched the game," which is obviously an enormous number.