<speculation>Maybe the contract they signed with Yahoo had a clause that bound them to transfer all data from Yahoo datacenters by a given date? Maybe the code

<speculation>Maybe the contract they signed with Yahoo had a clause that bound them to transfer all data from Yahoo datacenters by a given date? Maybe the code became so coupled with the Yahoo infrastructure that it would have been extremely difficult to deploy it somewhere else? Maybe – like most programmers – they underestimated the time needed to do the rewrite?</speculation>