Riot Games decided to block VPNs due to fans who didn't have access to League of Legends: Wild Rift using them to bypass server blocks and eventually made the experience worse for local players.
League of Legends: Wild Rift is hotly anticipated but we are getting a bit more perspective by how much thanks to the fact that the developers have to block VPNs to prevent too many people flooding the servers in the regions that currently have beta access.
According to the official blog post , the issues that arose with VPN users ranged from minor inconveniences such as language barriers to game-breaking issues like massive lag spikes for everyone involved. Therefore, it's hard to fault Riot for blocking the VPN users and restricting the game to select few regions.
The blocking will be done through select VPN services that were used the most to bypass region blocks but the team will keep monitoring the situation to see if additional VPN services will need to be blacklisted.
Even though this is for the best, Riot noted they aren't happy about having to turn off access to the fans outside the beta regions but it was crucial to do so, in order to not ruin the purpose of the beta tests through issues that wouldn't normally occur.
That said, even if someone from one of the beta regions uses VPN, the changes shouldn't affect these players. If they do, Riot suggested contacting player support.
There are currently no plans to revert the VPN changes but depending on the way things work out in the future, they might allow these services once again.