How did "Do you want to donate to charity?" become normalised when paying with card?

These days, and not (just) because I’m tight, I really only donate anything to one charity, which is an end-of-life hospice that operates in my local area. In the past I have undertaken charity events for Cancer Research, British Heart Foundation and Alzheimer’s Scotland. For a while I was making a regular donation each month to Cancer Research. I signed up to it in response to one of those adverts that you see on television: “a donation of x per month will…”, so I signed up - I’d lost relatives to that disease so it seemed appropriate. However, they screwed up with the direct debit (by their own admission) and took twice the amount they should have for about six months. Of course I felt guilty about asking for it back so I simply put the donation on hiatus for six months, then restarted it. What really pissed me off though was that about a year after restarting it I started getting phone calls from them asking if I could increase my donation. I told them it was what I could afford, and besides was about 3.5x more each month than their ad campaign asked for. It’s also been pointed out to me that in cases like cancer, there are links between the cancer charities and the pharmaceutical industry, an industry which would of course make billions of they successfully cure cancer. I’m sure the same is probably true for heart disease, and perhaps even for Alzheimer’s. When I lost my job 9 years ago I walked away from the donation. But as I say, I did a couple of fundraisers for my local hospice which relies heavily on donations to provide its service in my local community. Therefore I can be confident that the money is going where it should.