That is a good business. But the point is still pretty clear that Google seems to make very large investments into products that are then given away for free to

That is a good business. But the point is still pretty clear that Google seems to make very large investments into products that are then given away for free to many/most users (Search, Chrome, Gmail, the whole Google Workspace product suite, YouTube) with the no obvious business plan other than to drive ad revenue, sometimes in ways as indirect as just having people spend more time on the Internet.