Halo: Campaign Evolved's PS5 debut has been a mixed bag, according to early data. While it's currently second on the PS Store's best-sellers list in the US, it's only sixth in the UK, and Steam data shows a significant majority of purchases coming from the US. This American-centric trend is a reflection of Xbox's target market. On launch day, the game ranked 29th on the PS5 in the US, with around 1% of PS5 players loading it. It performed better on Xbox, accounting for 8% of players, and 14th on Steam, with 2% of players. The inclusion of the game with Xbox Game Pass is likely boosting its numbers there. However, some may have already played the Early Access version, which could impact overall sales. Despite this, the game hasn't been a flop, and there's a chance it may end up selling best on PS5 due to novelty and the lack of a subscription service. However, Microsoft's indecisiveness about releasing games on PS5 and the need for big sales numbers to justify future projects could be a challenge. The early data doesn't look particularly remarkable, and the game's success on PlayStation remains to be seen in the coming months. This raises a deeper question about the future of console exclusivity and the strategies of major publishers.