It's Google Cloud Platforms "AI" service[0], so actually more analogous to what is now called Azure AI Foundry[1], and what used to be called Azure OpenAI Studio.
Microsoft Copilot Studio[2] (formally Power Platform Power Virtual Agents) imho is unique in it's enterprise AI offering. I truly think Copilot Studio is going to be Microsoft's "killer app" when it comes to companies utilizing AI at scale internally, and not it's Azure service.
0. https://cloud.google.com/vertex-ai
1. https://ai.azure.com/
2. https://copilotstudio.microsoft.com