This is worse than what the title says. It doesn't after the search results. It changes the search terms you inputed.
It completely deletes what you put, to replace it (without anyone noticing it) with similar search words, but to get money from a brand or make you buy from that brand.
And when you buy or click on links, Google makes money because advertising and partnership.
Say you search for “children’s clothing.” Google converts it, without your knowledge, to a search for “NIKOLAI-brand kidswear,” making a behind-the-scenes substitution of your actual query with a different query that just happens to generate more money for the company
First, the generated results to the latter query are more likely to be shopping-oriented, triggering your subsequent behavior much like the candy display at a grocery store’s checkout
Second, that latter query will automatically generate the keyword ads placed on the search engine results page by stores like TJ Maxx, which pay Google every time you click on them. In short, it's a guaranteed way to line Google’s pockets.