Good thing they thought of that. Disclaimer: I was at Riot During some of the Valorant dev cycle and the stated goal in this tech blog [0] was a huge goal (keeping latency < 35ms).

This was only really doable because Riot has invested significantly in buying dark fiber and peering at major locations worldwide [1][2]

[0] - https://technology.riotgames.com/news/peeking-valorants-netc... [1] - https://technology.riotgames.com/news/fixing-internet-real-t... [2] - https://technology.riotgames.com/news/fixing-internet-real-t...