The WSOP have lots of detail on types of sponsorship detailed in the Tournament Rules book they put out on their website.
BUY IN SPONSORSHIPS RULES 2023
SECTION I – TOURNAMENT REGISTRATION AND ENTRY page 6
Third-party registrations for Participants are not permitted unless submitted by official WSOP sponsors, official WSOP promotional partners, or official WSOP product licensees. For more information regarding third-party entries, please contact
Johnny Hernandez by email at
jhernandez1@caesars.com.
SECTION V – PARTICIPANT LIKENESS AND IMAGE Page 9 (deals with size of patches, number, disallowed products or services etc etc
In the hay day of the Original November 9 main event I know that Dennis Phillips (chip leader) held out to the final table when he made a very lucrative deal with Poker Stars - they even allowed him to wear his signature St Louis Cardinals baseball cap to the final table. Times changed after the black Friday shut down of online sites in the United States regarding sponsorship deals (from interviews I have listened to) and are not nearly as profitable for the player as "the good old days" . Part of that is the elimination of the 120 days wait for the final table.