There is an entire (lengthy) thread on this issue.

See Re: Itsdeductible being discontinued.. WHAT??? - Page 4 (intuit.com)

Also, click the following link and then click "Send an e-mail" to voice your displeasure with the decision.

Intuit®: Company Executive Leadership

I think the problem is that is it not obviously monetized.  You want Intuit to provide a free service.  They have to see how the service makes them money and supports the cost of keeping it up, either by running ads, or by recruiting and retaining paying tax customers.   And, since they likely know exactly how many customers imported donations from ItsDeductible into their tax returns, that may be an uphill climb.  However, public outcry has caused them to reverse other decisions in the past. 

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@Opus 17 wrote:

I think the problem is that is it not obviously monetized.  You want Intuit to provide a free service.  

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Exactly, and they already offer Mint, which is "free". The primary issue here is the fact that Mint does not offer one component (at least not yet) of ItsDeductible and that is driving the complaints; users cannot enter donations of physical goods, such as household items, clothing, etc., get valuations, and then import the lot into TurboTax. 

Although I understand the inconvenience that may cause certain ItsDeductible users, I suspect it may not be an issue that adversely impacts a huge number of taxpayers due to (a) the large increase in the standard deduction that took effect several years ago, and (b) the value and frequency of such donations for most is probably fairly low.

Thank you, Champ!  It's almost impossible to find an e-mail address or phone number to complain to.