Advertising in the old days was mostly a combination of luck and guessing. To reach a potential market, advertisers had to spend money buying ads. Then they had to hope those ads were being seen by the people most likely to buy their products.
Purina ran into that same problem. They kept buying ads for cat products but finding those ads were being sent to dog people instead (and vice versa). Needless to say, this created a lot of wasted money and useless advertising.
Now Purina is joining the 21st century by using targeted ads to reach only those people most likely to buy their products. So cat people will no longer get ads for dog food and dog people will no longer get ads for cat food. Now everyone should be happy except for your cat if it doesn’t like any products sold by Purina.