Apple, Microsoft, Amazon?
Apple makes a decent penny on ads themselves.
Don’t forget all the technology these companies sell to empower the ad ecosystem.
None of these companies are ad-driven, or have cultures based upon them. Losing the ads division would not irreparably harm the business.
Youtube had 2021 revenues of $28.8b. Google ad revenue for 2021 was $209b. That's what an ad-driven business looks like.
Ads.