The outrage is real, the issue is that we are applauding a meaningless action. They bought the rights already money has already changed hands , rosanne isn't losing it. (For syndication.
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I'm no expert, but a lot of the money in reruns is from residuals, that is, payments to the original actors per actual broadcast. If they stop rerunning her past shows, she stops getting payments from them as a performer. If she actually owned a piece of her show, that would be a different source of income. Either way, if they cancel reruns she loses money.
https://www.sagaftra.org/content/residuals-faq