The hard part in all of this isn't finding and stopping spam - it's defining what spam is. Are all the pie recipes where there's a 2000 word essay about their grandma at the top 'spam'? They still have the recipe, and Google Home devices pick up the recipe instructions just fine so people end up not reading it, but many people would still consider that spam since it adds such an obstacle to getting the information you want. Same for cnet articles like "Best smart home devices to buy in 2022" - it's a reputable brand with a list of smart home devices, but it's hardly a review and exists to funnel people to their Amazon affiliate link.