I don't think that's been true for over a decade. Google has a pretty sophisticated internal payments system that handles terms customers, invoicing, payment initiation, and lots more.

I understand that Cloud specifically is switching to manage accounting using SAP, but most of Google runs via our own in-house systems.

Source: work at Google in payments. This is only my personal opinion.

Excel? Small and medium companies probably can run on Excel but I'm sure no large company can run their finance entirely with Excel. Google switched from Oracle to SAP. https://www.cnbc.com/2021/04/05/google-will-stop-using-oracl...

Do Google accountants use Sheets?