While I get what you're saying, I think it's exactly in that the expectations are different between a donation and a payment for product/service.

You pay for an existing product/service and expect that product/service to be fit for a need... that's generally it as far as expectations go... some may actually care about a company being a bad actor and boycott etc, but that's secondary in and of itself. You immediately get the product or service that exists.

A donation, is against expectations for results... though there may be other reasons to donate to a cause/charity.