Also worth noting that IBM stock price increased by $2Billion after defeating Kasparov. So they have had everything to gain by beating him at whatever cost.
The incentive of public companies is everything to do with stockprice, as it is the primary metric to rate the performance of a company? What does information availability have anything to do with the value of a company?
It'd be like a gumball machine trying to make itself more valuable. Just sell more gumballs at a hirer price.