The trust is in different areas. The risk that Google would ship something that steals your passwords, addresses, or credit card information and does anything harmful with it besides ad targeting is basically zero. You know what you're getting with Google for the most part. The risk in the case of downloading random binaries is they may actually steal your information and cause real harm beyond ad targeting.

If you want chromium without Google there are several options such as Edge, Opera, Brave and probably a dozen more I've never heard of.