Duck Duck Go recently admitted that they skew their results and were busted tracking; ddg is a non starter. Brave - which was started by the guy who invented Mozilla [firefox] but was ousted from his own company after he had the audacity to contribute to a Conservative political cause - is the go to these days. Braves search doesnt track, but still relies on some of joogles algorithms so your results are skewed. Use StartPage or Swisscows imnso; neither track and you will undoubtedly find something on SwissCows that you won't elsewhere. Startpage is more intuitive, but their image searches are awful.
Brave won't let you set Swisscows as default, so thats a headache. No one size fits all solution any more ... but ANYTHING connected to "G" is evil. Period.
And to answer the OPs original question, all the accounts/passwords are for tracking and marketing. Simple. [even tho there are often much more nefarious reasons/results than just that...]
Oh, and use TOR on anything that you can/is sensitive if youre worried about it. and a VPN.