Google Ads doesn’t officially classify their advertisers into just three tiers. However, advertisers of different sizes and spending levels do have varying experiences and access to support.

Here’s a more nuanced breakdown:

1. Small Advertisers: These are individuals or small businesses with limited budgets. They might spend anywhere from a few dollars to several thousand dollars a month. They typically use the self-serve interface and might not always have direct access to dedicated account managers from Google.
2. Medium to Large Advertisers: This can include bigger businesses or agencies managing accounts with substantial monthly spending (e.g., $10k, $50k, or even more per month). Advertisers in this tier often get access to Google account managers or representatives who provide insights, optimization suggestions, and other forms of support.
3. High-Spend Advertisers & Agencies: These are the largest advertisers or agencies managing substantial budgets, possibly in the millions of dollars a month. They often have dedicated teams from Google providing extensive support, insights, and access to beta features.

That said, the specific thresholds for spend and the services provided can vary based on regions, sectors, and other criteria. Google continuously evolves its products and services, so while these general tiers can provide a rough understanding, the exact categorization and offerings might change over time.

If you’re looking for the latest specifics on what Google provides to advertisers at different spending levels, it would be best to check directly with Google Ads’ official documentation or reach out to a Google representative.