They prevent the user from filing a class action lawsuit against them unless they mail them (Sony) a request in writing.
NOTE: THIS AGREEMENT CONTAINS A BINDING INDIVIDUAL ARBITRATION
AND CLASS ACTION WAIVER PROVISION IN SECTION 15 THAT AFFECTS YOUR
RIGHTS UNDER THIS AGREEMENT AND WITH RESPECT TO ANY “DISPUTE”
(AS DEFINED BELOW) BETWEEN YOU AND SNEI, SONY COMPUTER
ENTERTAINMENT INC., SONY COMPUTER ENTERTAINMENT AMERICA LLC,
THEIR AFFILIATES, PARENTS OR SUBSIDIARIES (ALL ENTITIES
COLLECTIVELY REFERRED TO BELOW AS “SONY ENTITIES”). YOU HAVE A
RIGHT TO OPT OUT OF THE BINDING ARBITRATION AND CLASS ACTION
WAIVER PROVISIONS AS FURTHER DESCRIBED IN SECTION 15.
http://www.sonyentertainmentnetwork.com/SEN-legal-docs/TERMS_OF_SERVICE_AGREEMENT-EN.pdf
Replies
Seems like they shouldn't or then everyone would make you sign a "you cant sue us clause in everything they do"