In Ready Player One Wade manipulates his assumed identity in order to be arrested and placed in indentured servitude in IOI's tech support department. During his shift people ask him questions about Oasis items like swords. IOI is an ISP (Internet Service Provider) while the Oasis is a console. Nobody would call up Verizon or AT&T and ask them why their Xbox in-game-purchase wasn't working.
We also see earlier on in the book that Wade worked 40 hours a week for a GSS subcontracted tech support firm. What service was IOI therefore providing?