Signing up for Fiber requires creating a Google account, and the way the policy is written, they can share non-personally identifiable information about your online activity with advertisers so long as they don't tie it to your Google account. Between those two clauses, and pervasive use of Search/Gmail/Analytics, there's probably little activity they can't pick up.
Also, note that they explicitly say they'll tie your TV-viewing habits to your Google account. It's easy to overlook this, but TV ad revenue is still 50% higher than online ad revenue, so this is a major synergy.
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Signing up for Fiber requires creating a Google account, and the way the policy is written, they can share non-personally identifiable information about your online activity with advertisers so long as they don't tie it to your Google account. Between those two clauses, and pervasive use of Search/Gmail/Analytics, there's probably little activity they can't pick up.
Also, note that they explicitly say they'll tie your TV-viewing habits to your Google account. It's easy to overlook this, but TV ad revenue is still 50% higher than online ad revenue, so this is a major synergy.