I dont believe google was an ad agency when they initially made chrome and for a long time following that. You cant conflate the two and say "what did you expect"
Google pulled the rug from under us on this. Albeit very slowly and super obviously.
Adsense was made in 2003. That's when Google entered the ad industry. Chrome was released in beta in 2008. That's 5 years of being an ad agency before creating Chrome.