Not sure if it is like that because I'm in Korea, but on my Samsung S9 Samsung is injecting ads for their new S24 in my notifications. I've had the phone for 5 years and this is the first time I see ads in my phone notifications, unbelievable.
Weird....I have been using Samsung phones for the past 4 years. I have never got such ads. I think you turned on the customization service or some other ad related thing. And ofcourse you can always debloat it. Ideally they should turn off customization service as default but since we live in a world of enshittification one can only dream.