Plus there are competitors of Google for their products.
Google Drive - Dropbox, Microsoft Cloud, etc.
Youtube - There are some shitty alternatives, but they still are present.
Google Ads - Bing Ads, Facebook Ads, Twitter Ads, etc.
Google Cloud - Amazon Web Services, and the many other web service companies
Google Browser - Firefox, Opera, Edge, etc.
Google.com - DuckDuckGo, etc.
And so on and so forth.
You should review the standards by which a monopoly is determined to be in violation of anti-trust laws. It is not as cut and dry as any competition simply existing. There are three main premises which many of these companies fall clearly under such as restraint of trade, market share, and market power among other things.
https://en.wikipedia.org/wiki/United_States_antitrust_law