Wait, what?? Hold on a second. Why do they feel the need to say this? Some important piece of information is being omitted here. It's like if you bought a box of cereal and it said on it, "Now, with 50% less cyanide!"
Is says it right in the second section of the post:
> This statement has been published in accordance with the Modern Slavery Act 2015 (the “Act”). It sets out the steps taken by Flutter Entertainment plc and our subsidiaries during the year ending 31 March 2021 to prevent modern slavery and human trafficking in our business and supply chains.
It appears to be in fulfillment of an obligation under UK law—from the statement itself: This statement has been published in accordance with the Modern Slavery Act 2015
> This statement has been published in accordance with the Modern Slavery Act 2015 (the “Act”). It sets out the steps taken by Flutter Entertainment plc and our subsidiaries during the year ending 31 March 2021 to prevent modern slavery and human trafficking in our business and supply chains.