This removes your right to sue Riot Games in court, including joining a class action lawsuit with other affected players, which can make it much harder to pursue small or individual claims.
Riot Games' Terms of Service significantly limit consumer rights by requiring mandatory individual arbitration and waiving the right to participate in class action lawsuits. Players have no ownership rights over virtual items or currency purchased, and Riot can terminate accounts or discontinue services at any time without refunds. You can opt out of the arbitration clause by sending written notice to Riot Games within 30 days of first accepting the Terms of Service.