1) If he's not hired, how is he going to sell his service? People will say "He couldn't even get himself hired!"
2) If he is hired and does a side job of teaching others for Google Interview, that's a gigantic conflict of interest (and probably a breach of NDA). He will be fired.
Is he planning to get hired, quit on the spot, and then start his tutoring service? (Well, stranger things have happened...)
IANAL, but I've heard in California at least, companies can't claim ownership over work you do on your own time on your own resources, that don't directly compete with the company.
Of course, things get muddier since Google does almost everything. But I doubt they'd want to engender ill will by suing an ex-employee for ownership.
1) If he's not hired, how is he going to sell his service? People will say "He couldn't even get himself hired!"
2) If he is hired and does a side job of teaching others for Google Interview, that's a gigantic conflict of interest (and probably a breach of NDA). He will be fired.
Is he planning to get hired, quit on the spot, and then start his tutoring service? (Well, stranger things have happened...)