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Ads as such are not the background problem. But the problem begins when they are based on user data and activities, instead of being contextual and when they are abusive and highly annoying, as they are often. Nobody wants several unskipable Ads of minutes on dishwasher or life insurance in the middle of a concert or that is difficult to read an article chopped by dozens of banners. Apart often also ads of fishy companies and services, which is also an security risk.
I use several search engines. All have their + and -. As main search I use Andi, apart Startpage, Mojeek, Whoogle, Ghostery Search, Groot and some others, apart some specific ones, like Forums, Pixabay, Wolphram Alpha, etc., I find what I’m searching for. Multisearch engines are fine, but they don’t show the same results of the engines which API’s they use. Apart of privacy, it’s mayby more important to avoid search engines which logs the searh history, because the filter bubble effect, causing an biased information.