But since we are asking users for their Google credentials, we thought it was more transparent to explain, for each service, why we needed it and what it meant. We prefer to be transparent than just ask for a bunch of permission without explanation as other services do.
And yes we are tight to Google because it was simpler for us to start this way. Again, most of the professionals we target use Google Workspace. In the future, the service could evolve and support other services like Outlook.