Advertisements in Browser Search Results

I made DuckDuckGo my default browser and search engine a year ago, fearing what would happen if Google ended up as the only browser and the only search engine. It seemed to work fine; gave much the same results as Google. I was quite satisfied.

I did not notice anything wrong till I come over to Mexico two months ago. Then I noticed that with every search there were some nonsense results (advertisements) at the top of the list of 'relevant finds'.  A very typical results was obtained when I searched for "King Henry the eighth". I got:

[1] "Compra Henry king - Sitio oficial de Amazon.com.mx 

Millones de productos de México y EEUU. Pago con tarjeta, efectivo y vales de despensa. Devoluciones en un plazo de 30 días a partir de la entrega para un reembolso total."

[2] "eBay Official Site - Henry Viii Books On eBay 

Looking For Henry Viii Books? We Have Almost Everything On eBay. But Did You Check eBay? Check Out Henry Viii Books On eBay. Under $10 · Money Back Guarantee · Daily Deals · Buy It Now Available Types: Fashion, Motors, Electronics, Sporting Goods, Toys"

Both were marked 'AD', I suppose admitting that they were advertisements. The third entry was Wikipedia. 

I admit that advertising is not my special subject. And I have heard phrases like "There is no such thing as 'bad publicity'." I also admit that these advertisements draw attention to the extraordinary range of products available from those two websites. 

However, their time-wasting arrogance annoys me. I would suggest to those two companies that these adverts might be counter-productive. And also to the DuckDuckGo search-engine. I must check when I get back to England –– does the same irritating nonsense occur back home? Perhaps not. At any rate I never noticed it.