>$340 million in Google Ads credits available to all SMBs with active accounts over the past year. Credit notifications will appear in their Google Ads accounts and can be used at any point until the end of 2020 across our advertising platforms. We hope it will help to alleviate some of the cost of staying in touch with their customers.

And you seem to be overlooking/ignoring:

>Google offers every employee annually to $10,000 from $7,500. That means our employees can now give $20,000 to organizations in their communities, in addition to the $50 million Google.org has already donated.

$20,000 x 100,000 employees = $2B in discretionary credits (not dedicated to new customers, but certainly does not exclude them)